Ingredients

1 tablespoon butter or margarine
1/2 large onion
1 (10 1/2-ounce) can reduced-fat cream of chicken soup, undiluted
1 (10-ounce) container refrigerated reduced-fat Alfredo sauce
1 (7-ounce) jar diced pimiento, undrained
1 (6-ounce) jar sliced mushrooms, drained
1/3 cup dry white wine
1/2 teaspoon dried basil
1 (10-ounce) package frozen chopped spinach, thawed
1 cup cottage cheese
1 cup ricotta cheese
1/2 cup grated Parmesan cheese
1 large egg, lightly beaten
9 lasagna noodles, cooked
2 1/2 cups chopped cooked chicken
3 cups (12 ounces) shredded sharp Cheddar cheese, divided