1 lb. ground chuck
1 med. onion, chopped
1 jar salsa
1 (8 oz.) can tomato sauce
1 pkg. corn or flour tortilla
10 oz. Monterey Jack cheese, grated
1 pt. sour cream
1 pkg. frozen chopped spinach, thawed

Brown beef and onions; drain fat. Add 1/4 can tomato sauce and 1/2 jar salsa to meat mixture. Combine remaining sauce and salsa in separate bowl. Simmer meat mixture. Grease deep casserole dish. Dip tortilla in sauce mixture. Line dish with coated tortillas. Pour in layer of meat, coated tortillas, meat, sour cream, spinach, then cheese. Bake at 375 degrees for 30 minutes, uncovering the last 15 minutes.