Classic buttercream frosting cupcakes

Cupcakes {sugar, bleached enriched wheat flour (flour, <span class="allergen">malted barley flour</span>, niacin, reduced iron, thiamine mononitrate, riboflavin, folic acid), water, <span class="allergen">eggs</span>, soybean oil, high fructose corn syrup, leavening (sodium acid pyrophosphate, baking soda, monocalcium phosphate, sodium aluminum phosphate, aluminum sulfate), nonfat milk, food starch-modified, salt, <span class="allergen">whey</span>, <span class="allergen">soy lecithin</span>, mono and diglycerides, polyglycerol esters of fatty acids, propylene glycol monoesters of fats & fatty acids, xanthan gum, sodium carboxymethylcellulose, natural & artificial flavor, potassium sorbate (preservative), yellow cupcake [egg whites wheat starch, palm and/or palm kernel oils, wheat protein, datem, polysorbate 60, glycerin, yellow 5 and 6, citric acid, sodium benzoate (preservative), carrageenan gum], chocolate cupcake [cocoa (processed with alkali), dextrose, sodium propionate (preservative), calcium sulfate, gum arabic]}, colored frosting [sugar, vegetable shortening (palm oil, soybean oil, mono and diglycerides, polysorbate 60), water, contains 2% or less of the following: corn syrup, artificial color, salt, natural and artificial flavor, natural flavor, potassium sorbate and sodium benzoate (preservatives), mono and diglycerides, guar gum, citric acid, water, sugar, us certified colors (yellow 5 and 6), modified corn starch, vegetable gum, citric acid, sodium benzoate and potassium sorbate (preservatives)].