1 medium onion, chopped
3 cloves garlic, minced
1 teaspoon Italian seasoning, crushed
1 (10.75 ounce) can Campbell's(r) Healthy Request(r) Condensed Cream of Celery Soup
1/8 teaspoon ground black pepper
1 (10 ounce) package frozen chopped spinach
1 cup plain nonfat yogurt
1 medium tomato, diced
4 cups hot cooked spaghetti, cooked without salt
2 tablespoons grated Parmesan cheese