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Preheat oven to 400.
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Prepare Dinner as directed on package.
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Cook meat with taco seasoning as directed on package.
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Add sour cream to the macaroni and cheese.
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Spoon half the macaroni and cheese/sour cream mixture into a deep dish pie plate or 8 inch square baking dish. Layer on meat mixture, half the cheddar cheese, and the remaining macaroni and cheese.
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Bake 15 minutes.
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Remove from oven, spread salsa on top of the casserole, then crushed chips, then cheese.
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Return to oven and bake an additional 5 minutes.