01 -
Preheat the oven to the temperature specified on the cake mix box. Grease a 9×13 inch baking dish with baking spray and set aside.
02 -
Prepare the cake mix according to the directions on the box.
03 -
Divide the batter into 4 equal portions. Add a few drops of food coloring to each portion (blue, green, pink, and yellow) and mix well.
04 -
Using a spoon, drop small portions of each colored batter alternately into the baking dish. Layer the colors until all the batter is used. Tap the baking dish on the counter to flatten the surface without mixing the colors. Optionally, swirl the colors gently with a toothpick, being careful not to overmix.
05 -
Bake the cake as directed on the cake mix box. Let the cake cool at room temperature for about 10 minutes after baking.
06 -
Using the handle end of a wooden spoon, poke holes all over the top of the cake, approximately 1 inch apart. Allow the cake to cool completely.
07 -
In a bowl, combine the instant pudding mix and milk. Whisk until the pudding dissolves. Before it fully sets, pour the pudding over the cooled cake, ensuring it fills all the holes. Spread any remaining pudding over the top and refrigerate until set.
08 -
In a chilled bowl, whip the heavy cream and vanilla extract until soft peaks form. Add powdered sugar and continue to whip until stiff peaks form.
09 -
Spread the whipped cream over the set pudding layer. Garnish the cake with sprinkles before serving. Store the cake in the refrigerator.