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["1.", "Preheat over to 325 degrees.", "2.", "Grease a 9 x 13 glass or stoneware pan with cooking spray.", "3.", "Slice the kielbasa into 3/8 in thick ""coins"".", "4.", "Cook elbow macaroni as directed on the package in a large pan (typically in 6 qts of water with 1 1/2 tsp salt for 8-10 minutes).", "5.", "While the pasta is cooking, dissolve the dry mustard in the water.", "6.", "In a 2 qt saucepan whisk together the dissolved mustard, milk, evaporated milk and flour until combined.", "7.", "Place the saucepan over medium heat and continue stirring until it begins to simmer.", "8.", "Drain pasta but do not rinse.", "Return to the pan and keep off of the heat.", "9.", "Add all three cheeses and the salt and pepper.", "10.", "Reduce the heat to low and continue stirring until all of the cheese melts and the sauce thickens slightly.", "11.", "Stir in the sour cream until completely incorporated into the sauce.", "Remove from heat.", "12.", "Pour the sauce over the macaroni.", "13.", "Add the sliced kielbasa and mix well over medium-low heat until warmed through.", "14.", "Pour the mixture into the 9 x 13 prepared pan.", "15.", "Crush the reduced-fat Ritz crackers and sprinkle on top of the mixture.", "16.", "Cover with aluminum foil and bake for 30 minutes, removing the foil for the last 10 minutes."]
