Crab Macaroni Casserole Recipe

Cook macaroni according to package directions. Meanwhile, in a large skillet, saute onion in butter until tender. Combine flour and milk until smooth; stir into pan. Bring to a boil; cook and stir for 1-2 minutes or until thickened. Remove from the heat. Drain macaroni. Add the crabmeat, sour cream, Swiss cheese, salt, mustard, macaroni and 1/4 cup cheddar cheese to the skillet. Transfer to an 11-in. x 7-in. baking dish coated with cooking spray. Sprinkle with remaining cheddar cheese. Bake, uncovered, at 350° for 20-25 minutes or until heated through. Yield: 6 servings.