Mexican Lasagna

I tried this the other day and we both really liked it! Its easy to make ahead and just stick in the oven.

1 lb. lean ground beef
1 large onion, chopped
2 cups Salsa
1 can (15 oz.) black beans, drained, rinsed
1/4 cup Italian Dressing
2 Tbsp. Taco Seasoning Mix
flour tortillas (8 inch)
1 cup Sour Cream
1 pkg. (8 oz.) Shredded Four Cheese

PREHEAT oven to 400ºF. Brown meat with onions in large skillet on medium-high heat; drain. Add salsa, beans, dressing and seasoning mix; mix well.
ARRANGE 3 of the tortillas in single layer on bottom of 13x9-inch baking dish; cover with layers of half each of the meat mixture, sour cream and cheese. Repeat all layers. Cover with foil.
BAKE, covered, 30 min. Remove foil. Bake an additional 10 min. or until casserole is heated through and cheese is melted. Let stand 5 min. before cutting to serve.