I borrowed this recipe from here after a friend came across it online. Had to try it since it looked so good! I followed the recipe exactly except that I used Cherry Chip cake mix instead of white or yellow. It tasted great! And I used up some of the many sprinkles/sequins/edible hearts/sparkling sugars that I have.
2 cups Cherry Chip cake mix
2 cups powdered sugar
1/2 cups (1 stick) butter cut into fourths
1/4 cup milk
1/2 cup white chocolate chips
1/4-1/2 cup sprinkles (and just like the recipe says, who measures sprinkles? Just to crazy!)
In a microwave safe bowl, combine cake mix and sugar. Add butter and milk. Microwave on high 2 minutes. Stir until combined. Add chocolate chips and stir again. Fold in half of sprinkles. Spread in to a greased or lined with parchment 8x8 pan. Add remaining sprinkles and press in. Refrigerate to set. Cut into 1 inch squares.