Prepare pasta according to package directions; drain. Place back in pan.
Stir in cheese, sour cream and milk; cook, stirring frequently, until cheese is melted. Stir in vegetables; salt and pepper to taste.
Transfer to a greased 2-quart baking dish. Bake in a preheated 375°F oven 20 minutes. Top with fried onions and continue baking 5 minutes or until bubbly and golden brown.
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