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1
Fry hamburger meat and onions together.
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2
Drain and set aside.
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3
Mix soup, water, tomatoes with chilies (I use Ro-Tel), and taco seasoning in a saucepan.
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4
Bring to a boil, reduce heat and simmer to blend flavors.
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5
Add meat and onions to the soup mixture (at this point, if the mixture looks a little too thick, you could add a tad more water, but usually you dont have to).
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6
Lightly grease a 9 x 12 casserole dish.
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7
Tear up tortillas (you may need a few more or less) into bite-sized pieces and layer on the bottom of the dish.
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8
Top lightly with grated cheese.
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9
Spoon on a portion of soup mixture.
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10
Continue this layering process until you are out of soup mixture and end by topping your last layer of soup with grated cheese (I use a cheddar/mozzarella blend).
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11
Bake at 350 degrees until melted and bubbly.
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12
Serve with your favorite tortilla chips.