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Nutrition information coming soon.
PREHEAT oven to 350°F. Melt butter in medium saucepan over low heat. Stir in flour and salt. Gradually stir in milk and bring to a boil. Cook, stirring constantly, until mixture is thickened and bubbly, about 5 minutes. Stir in cheeses and Mustard.
TOSS cooked pasta with cheese sauce and 1 cup Onions. Turn into 1-1/2-quart baking dish.
BAKE 20 minutes or until mixture is bubbling. Top with remaining onions and bake 5 minutes or until onions are golden.