Roast the Squash: Preheat oven to 400°F. Slice each spaghetti squash in half lengthwise, scoop out the seeds, and drizzle the cut sides with olive oil, salt, and pepper. Place them cut-side down on a parchment-lined baking sheet and roast for about 35–40 minutes, or until tender.
While the squash is roasting, make the turkey sauce. Heat a large skillet over medium heat. Add the ground turkey and cook until browned, breaking it apart with a spoon. Stir in salt, garlic, onion powder, and oregano. Once fragrant, pour in the marinara sauce and simmer for about 10 minutes.
Flip the roasted squash halves cut-side up and use a fork to gently loosen the strands. Spoon the turkey sauce evenly into each squash half and top generously with mozzarella cheese.
Return the spaghetti squash to the oven and bake for 10–15 minutes, until everything is hot, bubbly, and the cheese is melted and golden.
Garnish with more salt to taste, a pad of butter, microgreens and/or fresh parsley. Serve warm and dig in!
Nutrition information is an estimate for general guidance only. Variations in ingredients, brands, or calculation methods may affect the actual values.