Cut the spaghetti squash in half lengthwise and scoop out the seeds. Drizzle 1 tablespoon of olive oil over the cut sides, then sprinkle with salt and pepper. Place the squash halves cut side down on a baking sheet and roast for 30-35 minutes, or until tender.
While the squash is roasting, season the chicken breasts with salt, pepper, and dried oregano.
In a large skillet, heat the remaining tablespoon of olive oil over medium heat. Add the chicken breasts and cook for 5-7 minutes on each side until they are cooked through and golden.
Add the minced garlic, lemon zest, and lemon juice to the pan, cooking for an additional 2-3 minutes until the garlic is fragrant and the chicken is coated. Remove from heat.
Once the spaghetti squash is cooked, use a fork to scrape the flesh into strands and transfer to the skillet with the chicken. Add the fresh spinach and stir well to combine, allowing the spinach to wilt slightly.
Serve hot, garnished with grated Parmesan cheese and fresh parsley for added flavor and presentation.
Notes
Grated Parmesan cheese is optional for added flavor.