Meatball Mixture: In a large bowl, add 1 ½ pounds ground beef, ¼ cup almond flour, 1 egg, 1 teaspoon onion powder, 1 teaspoon kosher salt, ½ teaspoon garlic powder, ½ teaspoon dried basil, and ½ teaspoon ground black pepper. Mix thoroughly (using your hands is usually the easiest).
Form Meatballs: Take a heaping tablespoon of the ground beef mixture and use your hands to roll it into a meatball. Continue until all the meat is used (you should have around 20 meatballs). Place meatballs in medium-sized casserole dish, approximately ½ - 1 inch apart.
Bake: Sprinkle the tops lightly with additional salt and pepper and cover with 16 ounces marinara sauce. Cook for 25 minutes or until cooked through.
Add Squash: Add spaghetti squash to the dish and stir to loosely combine. Sprinkle with 1-2 tablespoons nutritional yeast (optional). Place back in the oven for 10-15 minutes.
Serve: Remove from oven and serve immediately!
Notes
Meal-Prep: simply make the meatballs ahead of time (you could even just bake them without the sauce if you wanted) then place them in a casserole dish, along with the sauce (if you haven't used it already) and reheat in the oven at 350 degrees F for 15-20 minutes (or until heated through). Then add the spaghetti squash for another 10 minutes.