Au gratin potatoes in a creamy cheese sauce

Dehydrated potatoes with sodium bisulfite (preservative), corn starch, maltodextrin, salt, enriched flour (wheat flour, niacin, iron, thiamine mononitrate, riboflavin, folic acid), semisoft cheese (milk, cheese culture, salt, enzymes), palm oil, contains 2% or less of each of the following: dehydrated onion, dehydrated garlic, corn syrup solids, potassium chloride, leavening (baking soda), modified corn starch, sodium caseinate, sodium phosphate, calcium phosphate, lactic acid, dipotassium phosphate, monoglycerides, blue cheese (cultured milk, salt, enzymes), annatto extract (color), reduced-lactose whey.