In a large bowl, combine flour, 2 cups sugar, cocoa, baking powder, baking soda, and salt. Add eggs, milk, oil, and 1 tablespoon vanilla; beat until well blended. Pour batter into prepared pans.
Step-by-step
Preheat oven to 350°F (175°C). Grease and flour two 9-inch round cake pans; cover bottoms with waxed paper.