Preheat oven to 350°F (175°C) and grease a baking pan.

In a large bowl, mix cake mix with eggs and vegetable oil according to package instructions. Pour into the prepared pan and bake for 25-30 minutes until a toothpick comes out clean.

Cool the cake for 10 minutes, then transfer it to a wire rack to cool completely.

Crumble the cooled cake into fine pieces in a large bowl.

Add buttercream frosting and mix until well combined; the mixture should be moist but not sticky.

Shape mixture into 1-inch balls and chill for at least an hour.

Melt chocolate melts according to package instructions. Dip each ball in melted chocolate, allowing excess to drip off, then add sprinkles while still wet.