Cauliflower Au Gratin
["2 small heads cauliflower, cooked", "1 Tbsp. mayonnaise", "1 lb. Velveeta cheese", "1 tsp. mustard"]
["Mix cheese, mayonnaise and mustard until melted.", "Pour over cooked cauliflower."]
["cauliflower", "mayonnaise", "Velveeta cheese", "mustard"]