How to Make Brownies with Shiny Thin Crust

Recipe By Tessa Arias
  |  
May 3rd, 2021

Here’s how to make brownies with shiny thin crust! The true hallmark of a perfect brownie is one that has that enviable shiny, glossy, crinkly, tissue thin crust on top. I’m sharing my 4 methods for perfectly crinkly brownie tops!

The true hallmark of a perfect brownie is one that has that enviable shiny, glossy, crinkly, tissue thin crust on top. Not every recipe yields that gorgeous crust. And not every baker can produce that crust reliably.

At least, not until they read this article! I’m diving into the science behind that shiny thin crust we all love and want for our brownies.

I have a LOT of brownie recipes in the archives of this website. Deciding which one to bake can be a challenge. The good news is that you can apply the methods I detail below to pretty much any recipe. Some of my published recipes already use these methods, and others can be benefitted from them to all but guarantee that brownie crust.

The Key To Glossy Brownie Crust? Dissolve Your Sugar Properly!

Dissolving sugar into the brownie batter is the key to developing that shiny crust. 

This is a challenge for a couple reasons, and is why that shiny, glossy, tissue thin crust can feel so elusive.

If you notice your brownie batter has lots of graininess to it from the sugar, it likely won’t develop a very pronounced brownie crust.

So what do we do? 

There are a few methods to improve how much the sugar dissolves into the batter.

All the methods described below were tested on my most popular brownie recipe: Best Chewy Brownies. That’s the recipe you see photographed in all the comparison shots in this article.

How to Make Brownies with Shiny Thin Crust

Method 1: Add Sugar to Hot Butter

There’s an important caveat to understand regarding this method: sugar only dissolves in water. Not fat. In fact, you can dissolve a lot of sugar in water — twice the amount by weight of sugar in any amount of water. If you’ve ever made simple syrup you know how sugar can dissolve completely into water. That same effect won’t happen if you heat oil and add sugar.

About twenty percent of butter is made of water. If that water content is hot from melting the butter when you add in the sugar, it will dissolve more readily into the water. This helps to create that shiny crust, not just on brownies but also chocolate cookies and even chocolate chip cookies using melted butter. I always add the sugar into the hot butter. Look what happens when you don’t:

overhead shot of crinkly crusts on hot butter vs cooled butter brownies
comparison of brownie slices made with hot butter vs cooled butter
Notice the brownies made with cooled butter are flatter. They also had a silkier and more gooey texture without that chewy bite. The texture just falls flat, which is why I always add the sugar to the hot butter when baking brownies!
comparison of hot butter vs cooled butter brownies
The hot butter brownies had a signitifantly shinier top crust as well as an improved texture!

It has the added benefit of cooling the butter more quickly so you can add your eggs sooner without scrambling them.

Method 2: Whipping Eggs + Sugar

slices of brown butter brownies with thin shiny crust on a wire rack

I first experimented with this technique of whisking the sugar into the eggs back in 2012. It helps to agitate the sugar to better dissolve into the water content of the egg whites and for the sugar and egg proteins to form bonds.

I originally learned about it from ScientificallySweet.com, but this meringue technique can actually be traced back as far as 1929, as Stella Parks describes in her recipe book, BraveTart: Iconic American Desserts, when discussing how Swans Down changed the brownie game by publishing a brownie recipe in a mail order cookbooklet where the “directions called for whipping the eggs with sugar and for melting the butter and chocolate into a sort of ganache. This made brownies more fudgy than cakey…”

The goal is to aerate the eggs and sugar so much that they create a foam. The intensity and structure of this foam yields different results:

In my Ultimate Fudgy Brownie recipe, I call for whipping the eggs and sugar for 3 minutes. This creates kind of a meringue crackled crust on top.

In my Brown Butter Brownies (pictured above), heavily inspired by Stella Parks, I call for beating the eggs and sugar until they’re completely and totally foamed, which takes around 8 minutes. The time actually totally depends on your mixer power.

In my Best Easy Brownie recipe, I shortcut this foaming technique by calling for whisking the eggs, sugar, and butter together by hand for 1 minute. However, this is done after the sugar is added to the hot butter and melted chocolate mixture. The heat encourages dissolution of the sugar into the water content.

Method 3: Use powdered sugar instead

comparison of brownie slice crusts of granulated sugar vs powdered sugar brownies
eye level comparison of granulated sugar vs powdered sugar brownies
Brownies made with powdered sugar have a shinier and more defined thin top crust. They’re also just slightly cakier in texture.
comparison of granulated sugar vs powdered sugar brownies

Powdered sugar is finely ground and will dissolve into the batter’s water content much more quickly and easily.

Swap in powdered sugar for granulated sugar using the following conversion:

1 cup granulated sugar = 1 ½ cups plus 2 tablespoons powdered sugar

Or, better yet, use a kitchen scale and just measure the same weight of total sugar.

Important sugar consideration: Your recipe must have ENOUGH sugar to develop a tissue thin crust. The sugar creates viscosity which is required to develop that crust. Well balanced brownie recipes have enough sugar to be fudgy and moist with the crust on top without becoming cloyingly sweet.

How MOISTURE Affects Brownies in Crazy Ways!

When it comes to dissolving sugar into brownie batter, it’s helpful to note there’s a small amount of water content in egg whites. There’s no real water content in melted chocolate. So basically, there’s not a lot of places the sugar can dissolve in a low moisture recipe like brownies! This is good, because as you’ll read below, too much water kills that shiny crust.

I know this seems counterintuitive since we need some water content for the sugar to dissolve into, but too much will create a looser consistency (instead of that thicker viscosity we need). This prevents the surface of the brownies from drying out enough to form that ‘skin.’

That’s why you’ll see me use whole eggs + egg yolks in my recipes. Too many egg whites adds too much water which creates brownies that have lots of holes on top instead of a nice crust.

This is also why my Browned Butter Brownie recipe has such a brilliant crust – the butter’s twenty percent water content has been evaporated in the browning process. Same goes with my Chewy Brownie recipe, which uses part butter, part oil. Oil contains no water.

The moisture conundrum is also why using brown sugar in a brownie recipe can negatively impact that glossy skin.

If you live in a very humid climate, it can be extremely difficult to achieve the brownie crust. Just like it’s difficult to create meringue-based desserts in humid climates, the moisture prevents the top of the brownie batter from drying out enough to create that skin.

Method 4: Use chocolate chips

Most brownie recipes that yield that crinkly crust involve solid chocolate in one form or another. Either you’re melting chocolate into your batter and/or adding chocolate chips.

One thought is that the melted chocolate contains more fat and less moisture than butter. So if a large portion of the fat in the recipe comes from chocolate, there will be less water to prevent that crust from forming.

My Best Chewy Brownie recipe contradicts this as it’s made with only cocoa powder and almost always yields a shiny crust. So I decided to do some testing.

What I discovered was that the chocolate chips can make a significant contribution to the development of that brownie skin. When I’ve made the same brownie recipes with and without chocolate chips, the chips enhance the shiny crust on brownies:

slices of chocolate chip brownies and no chocolate chip brownies
slices of chocolate chip brownies and no chocolate chip brownies
The chocolate chips not only help to enhance that top crust, but they also improve the thickness of the brownies. The texture difference otherwise comes only from the bites of chocolate chips.
crinkly crust comparison of chocolate chip brownies and no chocolate chip brownies

I’m not 100% sure why, but I have two thoughts on this. One is that the soy lecithin and milk solids in chocolate chips aid in the development of that crust. It could also be that chocolate chips include dissolved sugar already, and that’s what helps the crust to develop.

How to Add Chocolate Chips to Brownies:

For an 8 by 8-inch pan of brownies, add around ¾ cup (128 grams) chocolate chips. For a 9 by 13-inch pan of brownies, add 1 ½ cups (256 grams) of chocolate chips. Gently fold the chips in to the brownie batter as the final ingredient.

Bonus Tip: Chill Your Brownie Batter Overnight!

Allowing the brownie batter to sit for an extended period gives the sugar time to dissolve into the water content of the batter. This also thickens the batter.

Alice Medrich, author of Seriously Bitter Sweet: The Ultimate Dessert Maker’s Guide to Chocolate, writes that “refrigerating the brownie batter in the pan for several hours, or as long as two days before baking, wreaks enormous transformations: it improves the top gloss and crustiness, and it also blends the flavors so that the brownies taste much richer — and the texture is chewier too.”

Here are some final side-by-side looks at the SHOCKING differences between all these brownie made from the SAME recipe!!

overhead shot of slices of chewy brownies, no chocolate chip brownies, powdered sugar brownies, and cooled butter brownies
slices of chewy brownies, no chocolate chip brownies, powdered sugar brownies, and cooled butter brownies
Each of the above brownies pictured was made using my Chewy Brownie recipe, changing just one thing to track the differences.
overhead shot of chewy brownies, no chocolate chip brownies, powdered sugar brownies, and cooled butter brownies

Photos by Ashley McLaughlin.

Tessa Arias

About Tessa...

I share trusted baking recipes your friends will LOVE alongside insights into the science of sweets. I'm a professionally trained chef, cookbook author, and cookie queen. I love to write about all things sweet, carb-y, and homemade. I live in Phoenix, Arizona (hence the blog name!)

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  1. #
    Jen — May 3, 2021 at 5:58 pm

    I always learn so much after reading your blog to help improve my baking skill. Can’t wait to make some brownies.

    • #
      Tessa — May 4, 2021 at 7:59 am

      Thanks so much, Jen, for your kind comment! I’m so glad to help! Enjoy your brownies and your perfectly shiny thin crust! 🙂

  2. #
    Adriane — May 4, 2021 at 9:36 am

    Ive finally read the whole blog, actually was exicted when I first found out about this post. It’s such a bonus to learn and undertsand the science behind these experiments. Thank you Tessa, appreciate you always. God bless!

  3. #
    Adriane — May 4, 2021 at 9:43 am

    Now I learned new ways to achieve that crispy shiny crust, and found out that too much moisture content can affect that crusty top. I was mind blown just now! Time for me to make some brownies!

    • #
      Tessa — May 4, 2021 at 12:48 pm

      So happy to hear this article helped! Good luck!

  4. #
    Emma — May 5, 2021 at 6:59 am

    Thanks so much for this extremely interesting and informative post! I love it when you explain the science behind baking.

    • #
      Tessa — May 5, 2021 at 9:37 am

      It’s definitely one of my favorite topics, I’m happy to share 🙂 Thank you for letting me know!

  5. #
    Julie — May 5, 2021 at 11:31 am

    II love the experiments. Your chewy brownies are my “go to” but do you think that chopped chocolate would have the same effect as chocolate chips? I live in Switzerland and getting good chocolate is obviously not a problem, they don’t really do chocolate chips and, since I’ve not been able to get home, I’ve not been able to stock up.

    • #
      Tessa — May 5, 2021 at 2:26 pm

      Unfortunately, chocolate chips have a unique ability to help develop that crust, so chopped chocolate wouldn’t work as well.

      • #
        Julie — May 10, 2021 at 5:12 am

        I needed to follow up on this.

        I used the last of my chocolate chips to make a batch of brownies. The first words that my friend said was “Wow, how did you get that shiny, crinkly top?” Definitely worth using up the chocolate chips.

        • #
          Tessa — May 10, 2021 at 9:57 am

          Awesome!! I’m so happy to hear that 🙂

  6. #
    Anisah — May 9, 2021 at 2:58 am

    The recipe is to complicated do you have a more simple step by step for your brownies please

  7. #
    Rita — June 9, 2021 at 6:57 am

    Good Job! You are a true scientist. How fun! You get to eat your experiments!

    • #
      Tessa — June 9, 2021 at 2:27 pm

      haha, it’s a perk for sure! Hope these tips help in your kitchen as well! 🙂

  8. #
    Steve — June 22, 2021 at 8:15 pm

    Another informative and inspiring treatise. And being a logophile myself, I’ve learned a new word, cloyingly sweet. Thanks for sharing the knowledge.

    • #
      Tessa — June 24, 2021 at 9:41 am

      haha! I’m happy to hear you loved this article, Steve 🙂

  9. #
    Ruth — June 25, 2021 at 10:19 am

    Thank you for the well written articles you share. The article was very detailed and easy to understand for a beginners. I am planning on making my first batch of brownies tomorrow. Your book and magazine is a wonderful addition to my book collection and I have already tried 3 recipes from it and everyone of the recipes turned out wonderful. Thank you again!

    • #
      Tessa — June 28, 2021 at 1:04 pm

      You just made my day, Ruth, thank you so much for your sweet comment! I’m so happy to hear these tips helped! Let me know how your brownies turned out 🙂

  10. #
    Shirin — July 15, 2021 at 8:02 am

    Hello, i just read this articles cause i’m planning to bake your Brown Butter Brownie recipe tomorrow.. i have a question about refrigerating the brownie batter overnight..
    after refrigerate the batter, is it ok to bake it right away in the oven?

    • #
      Tessa — July 15, 2021 at 12:50 pm

      What would matter is making sure that the pan you use is able to go directly from a cold fridge to the oven. I’d suggest letting the pan sit out for a bit at room temperature before baking; otherwise, you may need to increase the baking time. Good luck, and enjoy your brownies!

  11. #
    Shweta — July 20, 2021 at 5:14 am

    This sounds so tasty!! Thanks for this easy, good for us recipe.

  12. #
    Heena — September 3, 2021 at 11:11 am

    Hey Tessa, how are you? Prepping up for fall? This is Heena, a fellow baker from Mumbai. This is such an amazing blog. As a brownie enthusiast it felt amazing to note things that can take my brownies to next level… however there’s always a hitch I face with eggless brownies. I combed through your blog but was unable to find one. My experiments in eggless brownies yielded me a nice paper shiny crust but not that fudgy interiors. Can you help me explain it pls (I have texted you on IG – sugarcravings_24)

    • #
      Emily — September 6, 2021 at 9:14 am

      Hi Heena, we don’t bake eggless recipes, sorry!

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