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Preheat oven to 350 degrees F.
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Cook ground beef and onions in a large skillet over medium heat. Cook until meat browned and onions have softened, about 8 minutes.
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Add tomato sauce salt, pepper, cumin, paprika, oregano, garlic powder, and onion powder. Stir and simmer for 2 minutes.
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Pour beef mixture into a 9-inch x 13-inch baking dish. Top with tater tots, being sure to spread them out into a single layer.
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Bake for 35 minutes. Remove from oven and sprinkle cheddar cheese all over the tater tots. Return to the oven and bake for another 10-15 minutes. The casserole is done when the tots are crispy, cheese is melted, and filling is bubbling.
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Remove from oven and let cool 10 mins. Top with green onion, tomatoes, olives, and red onion. Serve warm.