Preheat the oven to 425°F (220°C).
Lightly grease a 12×17-inch sheet pan with 1 tablespoon of olive oil.
On a lightly floured surface, roll out the store-bought pizza dough to fit the sheet pan dimensions.
Transfer the dough to the prepared sheet pan and gently press it to fit the pan edges.
Brush the dough evenly with the remaining 1 tablespoon of olive oil.
Spread the tomato sauce evenly over the dough, leaving a 1/2-inch border around the edges.
Sprinkle the shredded mozzarella cheese evenly over the tomato sauce.
Evenly distribute the sliced bell peppers, mushrooms, black olives, and red onion over the cheese.
Sprinkle the dried oregano, garlic powder, and crushed red pepper flakes evenly over the toppings.
Sprinkle the grated Parmesan cheese over the entire pizza.
Bake in the preheated oven for 18-20 minutes, or until the crust is golden brown and the cheese is melted and bubbly.
Remove the pizza from the oven and let it cool for 5 minutes.
Garnish with fresh basil leaves before slicing and serving.