Walking taco casserole

1° 12 lbs ground beef1/3 large onion, chopped° 1 can of green chili peppers, small tin1 can of enchilada sauce2 ounces of cream cheese1 bag of Fritos chips1 bag of grated cheese° 3⁄4 cup shredded lettuce12 cups fresh tomatoes, diced° 16 ounces of sauce 8 ounces of sour cream