Heat treat the cake mix first. Preheat your oven to 350oF. Spread the cake mix onto a baking sheet and bake for 5 minutes until the flour reaches a temperature of 160 degrees. Cool completely before adding to frosting.
Cream the butter first until light and fluffy.
Then add in the powdered sugar, with the mixer off 1/2 cup at a time. And the mix on low until combined.
Then increase the speed for 2-3 minutes until light and fluffy.
Add the vanilla extract and heavy cream.
Mix for 8 minutes until light and fluffy.
Add the cooled, heat treated cake mix.
Fold in the sprinkles until evenly combined.
When ready to use, with a pastry bag and tip attached, pipe the frosting on each cupcake. Decorate with additional sprinkles.