01 -
Preheat oven as specified on box. Grease a 9×13 inches baking dish. Prepare cake mix according to box directions.
02 -
Divide mixture into 4 equal portions. Add different food coloring to each. Drop spoonfuls of each color into pan, alternating colors. Tap pan to flatten surface, then swirl colors slightly with a toothpick.
03 -
Bake as directed. After cooling 10 minutes, use wooden spoon handle to poke holes all over cake, about an inch apart. Let cool completely.
04 -
Whisk pudding mix and milk until dissolved. Before pudding sets, pour over cake, filling holes completely. Spread remaining pudding on top. Refrigerate until set.
05 -
Beat chilled heavy cream and vanilla until soft peaks form. Add powdered sugar and beat to stiff peaks. Spread over pudding layer. Garnish with sprinkles before serving. Store in fridge.