Preheat broiler. In a small bowl combine salad dressing and garlic. In an extra-large skillet cook sausage and squash in 2 tablespoons of the dressing mixture for 8 to 10 minutes or until sausage is heated through and squash is almost tender, stirring occasionally.
Meanwhile, place bread on broiler pan; brush with 1 tablespoon of the dressing mixture. Broil 3 to 4 inches from the heat for 1 to 2 minutes until lightly toasted.
Serve sausage and squash with toasted bread. Drizzle with remaining dressing; sprinkle with green onions and oregano. If desired, pass Parmesan cheese.