Don’t be intimidated by the number of bowls in this photo; the ingredients you’ll need to make this cake (and the frosting) are kitchen staples you probably already have on hand. You will need several slices of bread, the white of five eggs (ideally room temperature eggs), flour, baking powder, vanilla extract, powdered and granulated sugar, whole milk, salt, and a neutral oil such as canola or vegetable. You will also need two 8-inch round cake pans, cooking spray, and some parchment paper.
So, why protein? “Any ingredient you put in a cake can change its color,” explains Morone. “Since this cake is supposed to be white, you only want to use the egg whites, because the egg yolks will make the cake more yellow.”