This makes about 42 cupcakes.
1 box chocolate fudge (or Devil's Food) cake mix
1 cup flour
1 cup sugar
3/4 tsp. salt
3 Tbl. cocoa powder
1-1/3 cups water
2 Tbl. vegetable oil
1 tsp. vanilla
1 cup sour cream
4 eggs
Preheat oven to 325 degrees. Mix all ingredients. (Perfect amount per cupcake liner: 1 regular scoop batter PLUS one mini scoop) Bake for 16 min.