Onion-Cheese Casserole
["2 c. finely crushed butter-flavored crackers (about 45 crackers), divided", "3 lb. onions, thinly sliced", "2 Tbsp. all-purpose flour", "1/2 tsp. salt", "1/2 tsp. pepper", "2 c. milk", "1/2 lb. pasteurized process cheese, cut into small pieces"]
["Preheat oven to 350\u00b0.", "Spread 1 cup cracker crumbs in a greased 8 x 11-inch baking dish.", "In a large skillet, melt 1/4 cup butter over medium heat.", "Add onions; cook until tender.", "Spoon onion over cracker crumbs."]
["butter", "onions", "flour", "salt", "pepper", "milk", "cheese"]