Italian Style Duck

Ingredients

• 1 small onion, chopped
• 1 c. sliced fresh mushrooms
• 6 Tbsp. butter or margarine, divided
• 1 can (29 oz.) tomato sauce
• 1/2 c. grated Parmesan cheese
• 1/2 c. minced fresh parsley, divided
• 1 envelope spaghetti sauce mix
• 1/2 c. all-purpose flour
• 1-1/2 tsp. onion salt
• 1-1/2 tsp. garlic salt
• 8 boneless skinless duck breast halves
• 1/2 c. shredded mozzarella cheese
• 1/2 c. shredded cheddar cheese
• Hot cooked pasta