Preheat oven to 350 degrees F.
Brown and drain beef and onion. Spread evenly over bottom of 2 quart casserole. Arrange tater tots evenly over beef mixture.
In small bowl mix soup, milk and seasonings until smooth and pour over tater tots. Sprinkle evenly with cheese.
Bake for 30 - 40 minutes until cheese is bubbly and slightly brown.
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