For the blondies you'll need...
For the brownies you'll need...
Combine butter, sugar, and eggs.
Stir in the dry ingredients.
Spread blondies evenly in pan then chill while prepping brownie batter.
Melt chocolate and butter. Whisk in eggs and sugar.
Stir in dry ingredients.
Drop brownie batter in large spoonfuls over blondies, then spread into an even layer.
Bake until a toothpick inserted into the center comes out clean.