Make a boxed cake as directed and allow the cake to cool completely.
Once the cake has cooled, cut into small pieces and place them in a large mixing bowl. Break up the pieces by hand or with a hard spoon to get small crumbles.
Take the container of frosting and mix it into the crumble mixture. This takes a little elbow grease to get it all mixed in. The mixture will be between a batter and a dough.
Prepare a cookie sheet with wax paper. Scoop out about 1 tablespoon of cake mixture and roll it into a ball between your hands. Place each ball on the wax paper and continue to make balls with the rest of the mixture.
Melt the candy coating in a microwave-safe bowl for 45 seconds. Stir the coating and continue to melt at 20-second intervals until fully melted. You can also use a double boiler on the stove.
Dip each ball into the melted coating and cover it completely. Tap off the excess coating and place the ball back on the wax paper. Immediately top the ball with sprinkles so they stick before coating sets.
Allow the balls to set completely before enjoying. You can speed up the process in the fridge, or if it's a really warm day, you should put them in the fridge so they set.