French Spaghetti

Ingredients

• 1 16-oz. pkg. thin spaghetti
• 1 medium onion, chopped
• 2 Tbsp. butter or margarine, melted
• 2 14-1/2 oz. cans stewed tomatoes, undrained
• 1 tsp. salt
• 1 4-12 oz. jar sliced mushrooms, drained
• 1 2-1/4 oz. can sliced ripe olives, drained
• 3 Tbsp. butter or margarine
• 3 Tbsp. flour
• 1 c. whipping cream
• 1/2 c. milk
• 3/4 c. grated Parmesan cheese