1. Repeat the layers with the remaining noodles, beef mixture, sour cream, and cheeses.
1. Sprinkle the grated Parmesan cheese evenly over the top of the casserole.
1. Cover the baking dish with aluminum foil and bake in the preheated oven for 25 minutes.
1. Remove the foil and bake for an additional 10 minutes, or until the cheese is melted and bubbly.
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