Preheat the oven to 350˚F.
Grease and line two 6-inch cake tins.
Prepare the Chocolate mix according to the box instructions.
Divide the batter evenly between the pans using a scale.
Bake for 20 minutes or until a skewer comes out clean.
Cool in the tins for 10 minutes, then transfer to a wire rack to cool completely.
Repeat the process with the Vanilla mix and cool completely.
Level off the cakes to have flat tops.