Pour marinara sauce into the bottom of a 5-6 quart slow cooker.
Cut spaghetti squash in half, scoop out all of the seeds, and place in the slow cooker hole side down into the sauce.
In a medium sized bowl add ground turkey, almond flour, egg Italian seasoning, garlic powder, onion powder, salt, and pepper. Mix well and form into 1 inch size meatballs and set aside.
In a large skillet pour 2 tbsp avocado oil over medium high heat. Sear meatballs for 3-5 minutes turning them until all sides are seared and brown (They will continue to cook in the slow cooker). Add meatballs to slow cooker. Cover and cook on low for 5-6 hours or on high for 2-4 hours.
When it is done cooking, carefully remove the spaghetti squash and use a fork to pull out the strands that will be similar to spaghetti. Serve the meatballs over the spaghetti squash and top with additional sauce.