Preheat oven to 400 degrees (F). Line a large baking sheet with aluminum foil; set aside.
In a large bowl combine the scooped out spaghetti squash flesh with 2 1/4 cups of the sausage sauce and 3 tablespoons of the parmesan cheese, mix well to combine.
Divide the saucy spaghetti squash mixture among the four empty squash shells, top with mozzarella and remaining parmesan, and place on prepared pan. Bake for 8-10 minutes, or until cheese has completely melted. Serve at once!
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