Spaghetti Florentine

Ingredients

• 1 medium onion , chopped
• 3 cloves garlic , minced
• 1 tsp. Italian seasoning , crushed
• 1 can Campbell's® Healthy Request® Condensed Cream of Celery Soup
• 1/8 tsp. ground black pepper
• 1 pkg. (about 10 oz.) frozen chopped spinach
• 1 cup plain nonfat yogurt
• 1 medium tomato , diced
• 4 cups hot cooked spaghetti , cooked without salt
• 2 tbsp. grated Parmesan cheese