Cook meat mixture: About 10 minutes prior to the spaghetti squash being done, bring a large cast iron skillet to medium-high heat and add olive oil (or ghee). Add garlic and cook for approximately 1 minute, or until fragrant. Add sausage, red onion, and salt and continue to move around pan until fully cooked.
Option to add vegetables: if you choose to add a vegetable, add it now, and cook for a few more minutes until tender but firm.
Add sauce: pour your spaghetti sauce of choice over the meat mixture, mix to combine, and continue cooking until heated through.
Assemble: add some spaghetti squash to a bowl (top it with a chunk of ghee and a pinch of salt and pepper) and pile the meat sauce on top.
Serve immediately.
Notes
Optional Vegetables: you can easily add some vegetables to this meat sauce in step 3, like mushrooms, zucchini, fresh spinach, etc.
Meal Prep: this could easily be meal prepped! Just make the sauce and the spaghetti squash and store in separate containers, reheat, and enjoy throughout the week!
Storage: place in an airtight container for up to 5-6 days. Recommended to store the meat sauce separate from the cooked spaghetti squash to prevent any sogginess.