Mac And Hamburger Casserole 1 pound ground beef 1 small onion, chopped 1 box Kraft Deluxe macaroni and cheese dinner, prepared 1 (10.75 ounce) can cream of mushroom soup 1/2 cup milk Salt to taste Preheat oven to 350. In skillet, brown beef and onion, drain. In bowl, combine remaining ingredients, mix well. Spoon into 9x13 inch baking pan. Bake for 20 minutes.