01 - Preheat oven to 425°F. Line a baking tray with parchment paper.
02 - Place the whole wheat pita breads flat on the lined baking tray.
03 - In a small bowl, combine the tomato sauce, dried oregano, and garlic powder. 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 evenly over the sauced pitas.
05 - Sprinkle the shredded mozzarella evenly over the vegetables, then crumble the feta on top if using.
06 - Bake for 10 to 12 minutes, until the cheese is fully melted and the pita edges are crisp and golden.
07 - Remove from the oven and immediately top with fresh basil leaves. Season lightly with freshly ground black pepper.
08 - Cut each pita into wedges and serve right away while hot.