In large skillet, brown sausage with onion, drain. In large mixing bowl, combine sausage and onions with next nine ingredients, making sure tortilla strips are separated. Spray 9 x 13 inch glass baking dish with no stick cooking spray. Pour tortilla mixture into prepared dish; smooth top so tortillas lay flat. Refrigerate, covered, six hours or overnight. Bake, uncovered, in preheated 325 deg. Oven until center is set (60-70 minutes). Let stand 15 minutes, cut into 12 squares.