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Preparation
Preheat oven to 350˚F. Heat oil in a large skillet over medium heat. Add onion and beef to pan. Cook for 8-10 minutes and season with salt and pepper.
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.
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