Creamy Chicken Enchiladas
["1 small onion, chopped", "1 (10 3/4 oz.) can condensed cream of chicken soup (undiluted)", "1 (10 3/4 oz.) can Ro-Tel diced tomatoes and green chilies (undrained)", "1 c. (8 oz.) sour cream", "1 c. (4 oz.) shredded Cheddar cheese, divided", "1 c. (4 oz.) shredded Mozzarella cheese, divided", "6 flour tortillas (8 1/2-inches)", "2 c. cubed cooked chicken breast"]
["In a skillet or saucepan coated with nonstick cooking spray, saut onion until tender. Remove from the heat. Add soup, tomatoes, sour cream, 3/4 cup Cheddar cheese and 3/4 cup Mozzarella cheese and chicken; mix well. Place approximately 3 tablespoons on each tortilla. Roll up tightly. Place seam side down in a 13 x 9 x 2-inch baking dish coated with nonstick cooking spray. Top with remaining soup mixture; sprinkle with remaining cheeses. Bake, uncovered, at 350\u00b0 for 20 to 25 minutes or until heated through."]
["onion", "condensed cream", "Ro-Tel", "sour cream", "Cheddar cheese", "Mozzarella cheese", "flour tortillas", "chicken breast"]