Chicken Spaghetti Casserole Recipe

Ingredients

• 8 ounces uncooked spaghetti, broken into 3-inch pieces
• 3 cups cubed cooked chicken
• 1 can (10-3/4 ounces) condensed cream of chicken soup, undiluted
• 1 cup 2% milk
• 1 medium onion, chopped
• 1 cup shredded sharp cheddar cheese, divided
• 1 cup shredded Swiss cheese, divided
• 1 can (4 ounces) mushroom stems and pieces, drained
• 1/2 cup chopped roasted sweet red peppers
• 3 tablespoons mayonnaise
• 1-1/2 teaspoons steak seasoning
• 1/2 teaspoon dried basil