Preheat the oven to 375F.

Add the cooked spaghetti squash to a large bowl, together with one cup of the cheese (mozzarella or Italian blend would work well), garlic, Italian seasoning, salt and pepper.

In a separate small bowl, beat together the egg and broth. Add this to the spaghetti squash and mix well. Spoon the squash into a small baking dish.

Cover with foil and roast for 15 minutes. Remove the foil, add the remaining cheese, and return to the oven uncovered until the cheese has melted and starting to turn golden brown - about 5-8 minutes.

Allow the casserole to stand for 5 minutes before serving.