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Preheat oven to 350°F (175°C).
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Cook beef and onion in a skillet over medium heat until beef is browned and onion is soft. Drain any excess fat.
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Mix filling: In a large mixing bowl, combine:
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Cooked beef and onion
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Cream of mushroom soup
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Cream of chicken soup
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Sour cream
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Diced tomatoes
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½ cup cheddar cheese
Mix until fully blended.
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Assemble:
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Layer frozen tater tots in the bottom of a greased 9×13-inch casserole dish.
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Pour the beef mixture evenly over the top.
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Sprinkle remaining ½ cup cheddar cheese over the casserole.
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Bake for 40–45 minutes, or until bubbly and golden on top.
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Cool slightly before serving. Enjoy warm!
