PREHEAT oven to 375° F. Spray 3-quart casserole dish or 13 x 9-inch baking dish with nonstick cooking spray.
COOK sausage in large skillet over medium-high heat until cooked through. Stir in garlic; cook for 1 minute. Stir in marinara sauce (reserve jar). Add water or wine to jar; cover and shake. Pour into skillet along with pumpkin and 2 tablespoons Parmesan cheese. Stir well. Stir in prepared pasta. Spoon into prepared dish. Sprinkle with remaining 2 tablespoons Parmesan cheese and mozzarella cheese; cover.
BAKE for 15 minutes. Carefully remove cover; bake for an additional 5 minutes or until cheese is melted and bubbly.