In large frying pan over medium heat, COOK beef until browned; REMOVE; POUR off most of the drippings.
ADD onions, bell peppers, garlic, salt and pepper; COOK until soft, about 15 minutes; REMOVE to bowl.
RETURN meat to skillet; ADD tomatoes, vinegar, cumin, oregano, salt and pepper.
BREAK up tomatoes with a wooden spoon; SIMMER 10 minutes.
LINE bottom and sides of a 2-quart baking dish with 4 tortillas.
PUT in half the meat and TOP with half the onion mixture; COVER with 2 tortillas.
REPEAT layering of meat and onion mixture.
SPRINKLE with cheeses; TOP with jalapeno pepper rings.
COVER loosely with foil; BAKE 20 minutes at 350° F; UNCOVER; BAKE 10 minutes longer.
Per Serving (excluding unknown items): 753 Calories; 50g Fat (59.4% calories from fat); 38g Protein; 38g Carbohydrate; 3g Dietary Fiber; 152mg Cholesterol; 1068mg Sodium. Exchanges: 2 Grain(Starch); 6 Lean Meat; 1 1/2 Vegetable; 9 Fat; 0 Other Carbohydrates.