MACARONI & CHEESE for TWO           INGREDIENTS 3 tablespoons melted margarine; 2 tablespoons cornstarch (flour can be used if you don’t have cornstarch); 1 and one half cups of milk; 8 ounces Velveeta cheese chopped into small cubes; salt and pepper; 1 cup elbow macaroni.           PREPARATION Butter one and a half quart casserole or aluminum pan. Cook elbow macaroni according to directions on box – set aside. Heat oven to 325 degrees. In small sauce pan melt margarine, mix in cornstarch, then add milk – over medium heat stir occasionally until milk is warm; add…