– Cooking spray
– 1 vanilla sponge cake mix
– Red gel food colouring
– Orange gel food colouring
– Blue gel food colouring
– Purple gel food colouring
– Rainbow sprinkles
– Icing
– 2/3 cup (75 g) icing sugar
– 2-3 tbsp water
Prep Time: 10 min
Cook Time: 40 min
Total Time: 50 min
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