1. Prepare Your Baking Surface: Preheat your oven to 400 F (200 C). Lightly grease a large baking sheet (approximately 13×18 inches) or line it with parchment paper for easy cleanup.

2. Roll Out the Dough: On a lightly floured surface, gently roll out your thawed sourdough pizza dough into a large rectangle, roughly 12×16 inches. The dough should be about 1/4 inch thick. If the dough springs back, let it rest for 5 minutes, then continue rolling.

3. Transfer and Score: Carefully transfer the rolled dough to your prepared baking sheet. Using a pizza cutter or a sharp knife, lightly score the dough into 12 equal squares. Do not cut all the way through, just score the surface to create guides for individual portions.

4. Add the Sauce and Cheese: Spread the pizza sauce evenly over the entire surface of the dough, leaving a small border around the edges. Sprinkle the shredded mozzarella cheese over the sauce, followed by the grated Parmesan cheese.

5. Distribute Toppings: If using, scatter your desired optional toppings evenly over the cheese. Don’t overload the squares, as this can make them soggy.

6. Season and Bake: Sprinkle the dried oregano over the toppings. Place the baking sheet in the preheated oven and bake for 18-22 minutes, or until the crust is golden brown and the cheese is bubbly and lightly browned.

7. Cool and Cut: Once baked, remove the pizza squares from the oven. Let them cool on the baking sheet for 5 minutes before using your scores as a guide to cut completely through the dough to separate the individual squares.

8. Serve or Freeze: Serve warm, or allow to cool completely before packaging for meal prep or freezing.