Creating Turkey Marinara Spaghetti Squash is simple with these clear steps:

1. Preheat the Oven: Begin by preheating your oven to 400°F (200°C).
2. Prepare the Squash: Cut the spaghetti squash in half lengthwise. Scoop out the seeds and discard them. Drizzle the inside with a little olive oil, and sprinkle with salt and pepper.
3. Roast the Squash: Place the halves cut-side down on a baking sheet and roast in the oven for 30-35 minutes or until tender.
4. Cook the Turkey: While the squash is roasting, heat a tablespoon of olive oil in a large skillet over medium heat. Add the diced onion and garlic, sauté until the onion is translucent.
5. Brown the Turkey: Add the ground turkey to the skillet. Cook until browned and fully cooked, breaking it up as it cooks.
6. Add Marinara Sauce: Pour in the marinara sauce, oregano, basil, salt, and pepper. Allow it to simmer for 10 minutes to let the flavors meld.
7. Scrape the Squash: Once the spaghetti squash is cooked, carefully scrape the insides with a fork to create spaghetti-like strands.
8. Combine: Toss the spaghetti squash strands with the turkey marinara mixture until well combined.
9. Serve: Plate the mixture and top with grated Parmesan cheese and fresh herbs if desired.