Vanilla cake with buttercream icing

Buttercream icing (powdered sugar [sugar, cornstarch], vegetable shortening [palm oil, soybean oil, cottonseed oil, monoglycerides, polysorbate 60], nonfat dry milk, dried egg whites, natural and artificial flavor, salt), sugar, enriched wheat flour (bleached wheat flour, niacin, reduced iron, thiamine mononitrate, riboflavin, folic acid), vanilla cake concentrate (bleached wheat flour, palm oil, dextrose, nonfat dry milk, modified food starch [corn], sugar, salt, potassium bicarbonate, sodium acid pyrophosphate, sodium stearoyl lactylate, cornstarch, natural and artificial flavors, color [yellow corn meal, spices {turmeric, annatto}, soybean oil], monocalcium phosphate, <span class="allergen">soy lecithin</span>, gums [cellulose, guar, xanthan]), <span class="allergen">eggs</span>, soybean oil, <span class="allergen">butter</span>, <span class="allergen">egg whites</span> (<span class="allergen">egg whites</span>, guar gum, triethyl citrate), <span class="allergen">soy lecithin</span>, emulsifier (water, mono - and diglycerides, sugar).