Add in any optional ingredients, like chicken or peppers.
Sprinkle mozzarella cheese on top.
Cover the pan with foil and bake for 25 minutes.
Remove the foil, sprinkle with Parmesan cheese, and bake for an additional 10 minutes, until bubbly and golden.
Serve
Serve straight from the pan, scooping generous portions onto plates. Enjoy with a simple side salad or garlic bread!