1. Preheat oven to 350°F. Line large baking sheet with parchment paper. Set aside.
2. In a large bowl, mix together the cake mix and baking powder. Set aside. In a smaller bowl, whisk together the eggs, butter, and vanilla by hand. Add the egg mixture to the cake mixture and stir to form a dough – stir vigorously until all of the pockets of dry cake mix are gone. Gently mix in the sprinkles.
3. Drop rounded 1-inch balls of dough onto prepared baking sheet. Bake for 9-12 minutes. Allow to cool on baking sheet for 3 minutes. Transfer to a wire rack to cool completely.
4. Fill with your favorite frosting (optional).