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["Cook macaroni according to package directions and drain well. Set aside.", "Place milk, flour, and onion salt in a quart jar. Cover tightly and shake vigorously for 1 minute.", "Stir together flour mixture, 3 1/2 cups cheese, and macaroni.", "Pour macaroni mixture into a lightly greased 13x9"" baking dish or two 11"" oval baking dishes. Stir in chopped, cooked ham (as much as you desire) before baking.", "Sprinkle evenly with breadcrumbs and remaining 1 cup cheese. Drizzle evenly with melted butter.", "Bake at 350 for 45 minutes or until golden brown.", "Sprinkle with chopped, cooked bacon before serving (as much as desired)."]