Super Mario Kart Sheet Cake

Ingredients

white cake mix: (sugar, enriched flour bleached (wheat flour, niacin, iron, thiamin mononitrate, riboflavin, folic acid), egg white, soybean oil, palm oil, egg yolk w/ silicoaluminate, leavening, water, contains less than 2% of nonfat milk leavening (baking soda, sodium aluminum phosphate, dicalcium phosphate, monocalcium phosphate), dextrose, modified tapioca starch, salt, propylene glycol, mono & diesters of fatty acid, sorbitan monostearate, tetrasodium pyrophosphate, xanthan gum, sodium stearoyl lactylate, polysorbate 60, mono & diglycerides, calcium acetate, guar gum, cellulose gum, artificial flavor, soy flour & enzyme.) chocolate cake mix: (cake mix (sugar, enriched flour bleached (wheat flour, niacin, iron, thiamin mononitrate, riboflavin, folic acid), egg white, cocoa processed w/ alkali, soybean oil, palm oil, leavening (baking soda, sodium aluminum phosphate, dicalcium phosphate, monocalcium phosphate)), water, contains less than 2% of egg yolk w/ sodium silicoaluminate, modified tapioca starch, carob powder, dextrose, propylene glycol, mono & diesters of fatty acids, salt, sorbitan monostearate, nonfat milk, maltodextrin, natural & artificial flavor, tetrasodium pyrophosphate, xanthan gum, mono & diglycerides, calcium acetate, polysorbate 60, guar gum, cellulose gum, red 40, soy flour & enzyme). buttercream icing: sugar, vegetable oil (palm oil, canola oil, mono and diglycerides, polysorbate 60), water, cocoa (processed with alkali), corn syrup. contains less than 2% of: color added (including: blue 1, blue 1 lake, blue lake 2, caramel, red 3, red 40, red 40 lake, yellow 5, yellow 5 lake, yellow 6, yellow 6 lake), citric acid, gum (guar, locust bean, xanthan), natural and artificial flavor, phosphoric acid, potassium sorbate (preservative), salt, starch, sorbic acid.