Slice the ciabatta bread in half horizontally and spread the butter over the halves. Sprinkle with the parsley, spreading into the butter. Place on a broiler-safe baking sheet, buttered-side up. Bake for 10 minutes.
Remove from pan and sprinkle with parmesan cheese. Adjust oven rack to the highest position and heat the broiler on high. Broil for 2 to 3 minutes, or until the cheese is bubbling and golden brown. Watch carefully.
Remove from oven and let cool for several minutes before slicing. Serve.
Notes
Though I find most ciabatta loaves to be quite large, feel free to use an entire loaf for this recipe.