01 -
Preheat oven to 175°C. Grease a 23x33 cm baking dish with nonstick spray.
02 -
Combine cake mix, water, vegetable oil and egg whites in a medium mixing bowl. Mix with a handheld mixer on medium until smooth.
03 -
Equally divide the cake batter into three separate bowls. Tint each portion with blue, purple, and pink gel food colors, stirring each until fully blended with no visible streaks.
04 -
Drop spoonfuls of each colored batter alternately into the prepared pan. Use a toothpick or skewer to gently swirl the batters for a marbled effect.
05 -
Bake for 25 to 28 minutes, or until a toothpick inserted into the center comes out clean. Start checking for doneness at 22 minutes. Remove and let cool completely.
06 -
Once cooled, use the rounded handle of a wooden spoon to poke holes in the cake at 2.5 cm intervals.
07 -
In a large bowl, whisk together french vanilla instant pudding mix and cold milk for 2 to 3 minutes until thickened.
08 -
Spoon pudding into the holes, then spread remaining pudding evenly over the cake. Gently smooth the thawed whipped topping over the pudding layer with a spatula.
09 -
Cover and refrigerate cake for 1 hour. After chilling, sprinkle unicorn sparkle candy sprinkles over the top. Slice into 15 portions and keep refrigerated until serving.