Betty Crocker Rainbow Cake. Steps 1 Heat oven to 350F. If you only have two cake tins make and bake one mix then clean the tins and make and bake the second mix.
Divide the mixture equally between the 3 cake tins and level the tops. Bake for 22-25 minutes or until a round bladed knife inserted into the centre of the cakes comes out clean. Spray 3 8-inch round cake pans with cooking spray.
Next make the cake mix batter as directed on the box of Betty Crocker white cake mix with the egg whites vegetable oil and water.
2 In large bowl beat cake mix water oil and eggs with electric mixer on low speed 30 seconds then on medium speed 2. Mix the eggs oil water and cake mix gently together and whisk by hand or electric mixer for 2-3 minutes until smooth and creamy. Grease and line the base of two deep 20cm cake pans. First gather your ingredients and preheat the oven to 325F.