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Preheat oven to 350 degrees. Butter a 13x9 inch baking dish.
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Cook pasta shells according to package directions. Drain and rinse with warm water. Return to pan and toss with melted butter.
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Meanwhile, cook ground beef in large skillet over medium high heat, breaking up into small pieces until cooked through. Drain.
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Reduce heat to medium low and add cream cheese, salt and chili powder.
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Simmer 5 minutes.
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Fill shells with beef mixture and arrange in baking dish.
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Pour taco sauce over shells.
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Cover with foil and bake for 15 minutes.
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Uncover and top with cheese. Sprinkle crushed chips over the top and bake uncovered for additional 15 minutes or until bubbling.
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Serve warm, garnishing with additional toppings.