Pour batter into prepared pan. Bake for 25-30 minutes for 9x13 pan or 15-18 minutes for cupcakes or until toothpick inserted in center comes out clean.
Add 1/4 of the container of frosting. You can use the back of a large spoon or do it like me and use your hands. Mix until it is thoroughly combined. It should be the texture of play-doh. You might need to add a bit more frosting, but you don’t want it to be too moist. Mix until combined.
You can make the cake balls ahead of time and store them in an airtight container in the refrigerator for up to 3 days or in the freezer for 1 month.