In the bowl of a stand mixer, combine the softened butter and sugar. Cream until smooth.

Add in the dry ingredients - flour and dry boxed cake mix. Mix on low speed just until combined - it will be crumbly looking.

Add in the vanilla, salt and milk. Mix on low speed until the mixture combines and a dough forms. You should be able to press it together and it forms a ball.

Chill the dough for approximately 30 minutes.

When ready to assemble, place the white chocolate chips in a microwave safe bowl and heat in 30 second increments. Stir melted chocolate until smooth.

Using a small cookie scoop, scoop 1-inch balls.

Using a spoon, dip each cake ball into the melted white chocolate and tap the excess off into the bowl.

Transfer the dipped cake ball to a sheet of parchment paper.

Before the white chocolate sets, decorate with the rainbow sprinkles.

Allow to set.