This Vegan Spaghetti Squash Recipe is easy and impressive. I like to use homemade Marinara sauce, but I used store-bought to test and for the nutrition, just incase that was your plan too. If you don't need the recipe to be vegan, you could use regular mozzarella. Special Tip: I like to serve these in the spaghetti squash hulls, so save them for the fancy serving seen above.