Chicken Manicotti: Stuffed Pasta with Bechamel Sauce

Ingredients

• 6 ounces cream cheese, softened
• 1 cup sour cream
• 1/4 cup minced fresh parsley
• 1/2 teaspoon salt
• 1/4 teaspoon pepper
• 4 cups cubed cooked chicken
• 1 medium onion, finely chopped
• 1 can (8 ounces) mushroom stems and pieces, drained
• 1 tablespoon butter
• 14 manicotti shells, cooked and drained
• SAUCE:
• 6 tablespoons butter
• 6 tablespoons all-purpose flour
• 1/4 teaspoon salt
• 3-1/2 cups 2% milk
• 3 cups shredded Monterey Jack or cheddar cheese
• 4 tablespoons shredded Parmesan cheese, divided