- Preheat oven to 400 degrees F (200 degrees C).
- Place the squash halves cut-side up on a baking sheet.
- Bake in preheated oven for 30 minutes, or until slightly softened.
- While the squash is baking, heat the olive oil in a large skillet over medium heat.
- Add the sausage and cook, breaking it up with a spoon, until browned.
- Add the onion and garlic and cook until softened, about 5 minutes.
- Pour in the marinara sauce and stir in the Italian seasoning. Simmer for 10 minutes to allow the flavors to meld.
- Remove from heat and stir in the Parmesan cheese, salt, and pepper.
- Remove the squash from the oven and fill each half with the sausage mixture.
- Top with shredded mozzarella cheese.
- Return to the oven and bake for 15-20 minutes, or until the squash is tender, the filling is heated through and the cheese is melted and bubbly.
- Garnish with fresh basil or parsley.
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