Making French Onion Soup Pizza is a straightforward process if you follow these steps:

1. Preheat Oven: Preheat your oven to 475°F (245°C). If using a pizza stone, place it in the oven to heat.
2. Caramelize the Onions: In a large skillet, heat olive oil over medium heat. Add the sliced onions and salt, stirring occasionally.
3. Add Sugar and Garlic: When the onions begin to soften, add sugar and minced garlic. Cook for about 20 minutes, stirring frequently, until the onions are golden and caramelized.
4. Stir in Thyme and Broth: Once caramelized, add thyme and broth to the skillet. Cook until slightly thickened, around 5-7 minutes. Remove from heat.
5. Prepare Pizza Dough: Roll out your pizza dough on a floured surface to your desired thickness. Transfer it to a pizza stone or baking sheet.
6. Spread Onion Mixture: Evenly distribute the caramelized onion mixture over the pizza dough, leaving a small border around the edges.
7. Add Cheese: Sprinkle the shredded Gruyère and mozzarella cheese generously over the onions.
8. Bake the Pizza: Place the pizza in the oven and bake for 12-15 minutes, or until the cheese is bubbly and the crust is golden brown.
9. Cool Slightly: Once baked, remove the pizza from the oven and let it cool for about 10 minutes.
10. Garnish and Serve: Sprinkle with fresh parsley and black pepper. Optionally, drizzle with balsamic glaze before slicing.

These steps will guide you through creating a delightful French Onion Soup Pizza that is sure to impress.