Step 1

Spray 8×8 baking pan with nonstick spray. Set aside.

Step 2

Mix together cake mix and powdered sugar in a large bowl. Add milk and butter (do not stir them in) and microwave for 2 minutes. Once done, immediately begin mixing everything together until the butter is fully melted. The batter will be very thick. Fold in white chocolate and sprinkles. Stir gently. You do not want the sprinkles to leak their color.

Step 3

Spoon into prepared baking pan, making sure it is level and smooth at the top. Chill in the refrigerator for at least 2 hours. Cut into squares and enjoy. Store in the refrigerator.