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Preheat the oven to 350°F (175°C) and grease a baking dish.
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Spread the tater tots in an even layer at the bottom of the dish.
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In a large bowl, mix the shredded chicken, crumbled bacon, and cheddar cheese.
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In another bowl, combine the ranch seasoning mix, sour cream, and cream of chicken soup.
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Pour the soup mixture over the chicken mixture and stir well to combine.
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Spread the chicken mixture over the tater tots in the baking dish.
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Bake in the preheated oven for 40-45 minutes or until the casserole is bubbly and the tater tots are golden brown.