This recipe calls for 1 cup of butter, 1 cup of brown sugar, 1/2 cup of sugar, 1 teaspoon of vanilla, 3 eggs, 1 cup of cocoa powder, and 2 cups of flour. To make the brownies, mix the butter and sugars until blended, then add the eggs and vanilla and stir to combine. Mix the dry ingredients separately and stir them into the wet mixture. Pour into a greased pan and bake for 25 minutes, until the sides start to pull away from the pan. Cut and serve the brownies once baked.