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["NOTE: This recipe can be prepared in two methods -- ""crusty"" (baked), or ""creamy"" (stovetop). SET oven rack to center position; PREHEAT oven to 375u00b0F if using the ""crusty"" baked macaroni and cheese option in Step 9; SPRAY a 9 x 13 baking dish with non-stick baking spray; SHRED 16 ounces (1 lb.) sharp cheddar cheese; SET aside.", "BRING 4 quarts (16 cups) water to a rolling boil; ADD 1 tablespoon salt and 4 cups dry medium elbow macaroni; BLANCH macaroni until just tender; DRAIN cooked macaroni in colander, scraping all pasta from pot.", "RINSE drained macaroni in colander under cold running water for 30 seconds; ALLOW macaroni to drain; RETURN empty pot to stovetop on medium-low to medium heat.", "MELT 6 tablespoons margarine in pot; ADD 2 tablespoons flour and 2 tablespoons cornstarch to make a roux; COOK over low heat, whisking until light golden (do not scorch).", "POUR in 4 1/2 cups skim milk while whisking; ADD 1/2 teaspoon salt and 1/8 teaspoon citric acid; STIR; RAISE heat to medium.", "ADD one (8 ounce) can Kraft Sharp Cheddar Easy Cheese; REDUCE heat to low; ADD 16 ounces shredded medium cheddar cheese; STIR constantly over lowest heat until mixture melts and becomes very smooth and consistent in texture.", "ADD rinsed drained macaroni to pot; WHISK to separate any clumped macaroni and combine; ADD salt to taste if necessary.", "POUR then scrape mixture into greased 9 x 13 baking dish (for make-ahead freezing only, use greased cake or loaf pans); SET baking dish over a large baking sheet covered with foil.", "FOR CRUSTY MACARONI AND CHEESE: Leave baking dish uncovered; Bake at 375u00b0F for 30 minutes. Allow to cool and set for 10 minutes. Serve and enjoy!", "FOR CREAMY MACARONI AND CHEESE: Simmer over medium-low heat, stirring often until desired consistency is achieved. Serve and enjoy!"]