Preheat oven to 400 degrees and line rimmed sheet pan with foil or parchment paper.
Take a fork and poke holes all over the spaghetti squash then put on a plate and microwave for 5 minutes. Let cool for a few minutes after!
Take the spaghetti squash and cut in half lengthwise then remove the seeds with a spoon and discard.
Drizzle the inside of each spaghetti squash with olive oil, and season with salt and pepper and then place cut side down onto greased baking sheet. Bake for 30-40 minutes, until squash releases easily.
Meanwhile, heat a few T olive oil in a large nonstick skillet over medium high heat. Add ground turkey or beef and cook, breaking up with the back of your spoon until fully cooked through. Season well with salt and pepper and add marinara sauce. If you are adding in the optional- add in’s, now is the time to add spinach, Italian seasoning, and garlic powder. Stir to combine and cook another few minutes until spinach is wilted.
When spaghetti squash is finished, flip over and use a fork to shred and fluff the inside flesh so it’s no longer attached to the walls and makes a nest, if you will. Fill each half with Meat sauce, top with mozzarella cheese and bake for an additional 5-6 minutes, until cheese is melted.
Top with fresh basil and serve! Also an option to add parmesan and red pepper flakes before serving as well.