In a dutch oven or steamer, begin by fully steaming the spaghetti squash. Once it is steamed, scrape out the seeds with a fork. Then, use a fork to scrape out the remaining spaghetti squash and set aside.
While the squash is steaming, warm the olive oil in the skillet and cook the Italian sausage. Once this is nearly done slice the sausage. Next, add in the steamed and scraped spaghetti squash into the skillet and then add the garlic. Let this simmer for 10 minutes or until the spaghetti squash is cooked to your preference. I like to keep ours a little more crisp.
Serve the spaghetti and sausage mix topped with marinara sauce, parsley, and cheese.