Cowboy Cornbread
Ingredients:
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2 pounds ground beef
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1 small onion, chopped
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2 (7 ounce) packages sweet yellow cornbread mix (such as Martha White®)
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1 cup milk
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2 eggs
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1 (15 ounce) can creamed corn
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2 cups shredded Cheddar cheese
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2 tablespoons butter, or more to taste