Birthday Cake Blondie with Classic White Icing

Blondie (Sugar, Enriched Bleached Flour Wheat (Flour, Niacin, Iron, Thiamine Mononitrate, Riboflavin, Folic Acid), Water, Soybean Oil, Contains 2% Or Less Of: Baking Soda, Cornstarch, Defatted Soy Flour, Egg Whites, Egg Yolks, Salt, Whey, Corn Syrup, Degermed Corn Grits, Palm Oil, Titanium Dioxide, Red 40, Yellow 5, Blue 1, Dextrose, Natural & Artificial Flavors), Classic White Icing (Sugar, Water, Corn Syrup, Soybean Oil, Glycerin, Contains 2% Or Less Of: Agar, Calcium Carbonate, Calcium Sulfate, Carob Bean Gum, Citric Acid, Cornstarch, Dextrose, Maltodextrin, Modified Food Starch, Monosodium Phosphate, Natural & Artificial Flavors, Natural Tocopherols (Antioxidant), Potassium Sorbate (Preservative), Refined Corn Oil And/Or Refined Soybean Oil, Titanium Dioxide (Color), Tricalcium Phosphate (Anti-Caking))