While beef mixture cooks bring a pot of water to boil and cook noodles for 3 minutes only. Reserve 2 cups cooking water. Drain and set aside.
In mixing bowl whisk together sour cream, cream cheese, cornstarch, and ½ cup noodle water until smooth.
Stir in noodles and remaining reserved noodle water. Pour noodle mixture into greased 9”x13” deep-sided baking dish. Sprinkle with salt and pepper.
Top with beef mixture and level with back of spoon making sure each noodle is covered. Top with cheese. Bake for 25-30 minutes in center of oven or until cheese begins to brown.
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