In a medium bowl whisk together the flour, baking powder, baking soda, and salt.
In a large bowl with an electric mixer, beat the butter on high speed until smooth and creamy, about 1 minute. Add the sugar and beat on high speed for 3 to 4 minutes, until light and fluffy. Scrape down the bowl as needed. Add the eggs, egg yolks, and the vanilla one at a time, beating well between additions until combined. If the mixture looks separated, just keeping beating until emulsified. Beat in the sour cream until combined.
Divide the batter evenly among the prepared pans and bake for about 25 to 30 minutes, or until a toothpick comes out clean. Let cool for 20 minutes in pans before turning out onto a cooling rack.
This recipe makes 24 cupcakes. Bake for 17 to 20 minutes, or until lightly golden brown at the edges and a toothpick comes out clean.
Best Yellow Cake Recipe https://handletheheat.com/best-yellow-cake-recipe/ February 25, 2020