01 - Preheat the oven to 425°F (220°C). Line a baking tray with parchment paper and set aside.
02 - Place the whole wheat pita breads flat on the prepared baking tray, ensuring they do not overlap.
03 - In a small bowl, combine the tomato sauce, dried oregano, and garlic powder. Stir until well blended, then spread the mixture evenly over each pita, leaving a small border around the edges.
04 - Distribute the diced bell pepper, seeded tomatoes, red onion slices, mushrooms, and baby spinach leaves evenly over the sauced pitas.
05 - Sprinkle the shredded mozzarella evenly over the vegetables, then scatter the crumbled feta on top if using.
06 - Bake for 10 to 12 minutes, or until the cheese is fully melted and the pita edges are golden and crisp.
07 - Remove from the oven and top with fresh basil leaves. Season lightly with freshly ground black pepper, slice each pita into wedges, and serve immediately.