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Preheat oven to 350. Spray 13x9 baking dish.
Cook pasta according to pkg directions. Drain and place in prepared dish.
Meanwhile, place beef and onion in lg. skillet; season with salt and pepper. Brown beef over medium-high heat until beef is no longer pink, stirring to separate meat. Drain fat. Stir in chili, tomatoes with juice, 1 cup cheese, sour cream, chili powder and garlic powder.
Add chili mixture to pasta; stir until pasta is well coated. Sprinkle with remaining 1/2 c. cheese.
Cover tightly with foil and bake 30 min. or until hot and bubbly.
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