Cheddar Chicken Mostaccioli

Ingredients

• 1/2 cup chopped onion
• 1/2 cup chopped celery
• 1 tablespoon butter
• 1 can (10-3/4 ounces) condensed cream of mushroom soup, undiluted
• 1 can (10-3/4 ounces) condensed cream of chicken soup, undiluted
• 1/2 cup whole milk
• 1 can (4 ounces) mushroom stems and pieces, drained
• 1 jar (2 ounces) diced pimientos, drained
• 1/4 cup sliced pimiento-stuffed olives
• 1 tablespoon Worcestershire sauce
• 1-1/4 teaspoons garlic salt
• 1/2 teaspoon each dried basil, oregano and pepper
• 4 cups diced cooked chicken
• 3 cups mostaccioli, cooked and drained
• 1-1/4 cups shredded cheddar cheese, divided
• 1 cup shredded Swiss cheese