Saute beef and onion until lightly browned, stirring to crumble meat. Stir in remaining ingredients, except tortillas and cheese. Alternately layer meat and tortilla, beginning and ending with meat, in 9x13 inch greased pan. Sprinkle with cheese. Cover with foil, seal, and freeze.
To serve, thaw in refrigerator. Remove foil and bake at 350 degrees for 35 mins until bubbly.
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