Cook the spaghetti squash in the oven or Instant pot. See recipe notes.
While the spaghetti squash is in the oven or Instant pot, cook the ground turkey and set it aside. Sprinkle a pinch of salt, pepper, and garlic powder.
Heat olive oil in a large saute pan over medium heat, add diced onion and cook until tender. (~5 minutes).
Add the garlic, red pepper flakes, fennel and cook for ~1 minute.
Add the turkey, tomatoes, tomato paste, Italian seasoning, bay leaves, paprika, balsamic vinegar, salt, pepper and bring it to a simmer. Simmer the meat sauce on low until your squash is done.
In a small bowl, mix the ricotta and fresh basil together. Set aside.
Once your squash is done, use the tines of a fork to fluff up some of the spaghetti squash strands. Then, scoop some of the basil/ricotta mixture into the squash halves. Followed by some of the meat sauce and place mozzarella on top. (No real measurements here, just load it up!)
Broil in the oven for 1-3 minutes, or until cheese has melted and turned a golden brown!