INGREDIENTS
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1 lb extra-lean ground beef
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1 cup onion, chopped
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1 can (14 oz) diced tomatoes, drained
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1 1⁄2 cup frozen corn
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1 can (15 oz) black beans, drained and rinsed
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1 tsp red pepper flakes
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1 cup fat-free sour cream
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1⁄2 cup low-fat cheddar cheese, shredded