Ingredients
Method
- Preheat the oven to 350 F. In a large bowl, mix together butter, brown sugar, eggs, and vanilla extract until smooth. Add in the flour, salt, and baking powder until smooth. Divide the batter into two bowls.
- Add green food coloring to one bowl and blue to the other. Pour each batter into a greased 8-inch square baking dish, and swirl with a knife. Bake for 20-25 minutes.