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1. In a large mixing bowl, combine the all-purpose flour, salt, and baking powder. Whisk together until well mixed.
2. Make a well in the center of the dry ingredients and add the olive oil and warm water.
3. Using a wooden spoon or your hands, mix the ingredients until a dough begins to form. If the dough is too sticky, add a little more flour, one tablespoon at a time, until it is manageable.
4. Transfer the dough to a lightly floured surface and knead for about 5-7 minutes until the dough is smooth and elastic.
5. Shape the dough into a ball and place it in a lightly oiled bowl. Cover with a clean kitchen towel or plastic wrap and let it rest for 30 minutes at room temperature.
6. While the dough is resting, prepare your toppings. Start by slicing the cherry tomatoes in half and quartering the artichoke hearts.
7. Thinly slice the red onion and set aside.
8. In a small bowl, combine the crumbled feta cheese, sliced black olives, and chopped fresh basil. Mix gently to combine.
9. Preheat your oven to 475°F (245°C) or prepare a grill for high heat if you prefer grilling the flatbread.
10. After the dough has rested, transfer it back to a floured surface. Divide the dough into two equal portions for two flatbreads.
11. Using a rolling pin, roll out one portion of the dough into a rectangle or circle, about 1/4 inch thick. If the dough sticks, sprinkle a little flour on the surface and the dough.
12. Transfer the rolled-out flatbread to a baking sheet lined with parchment paper or a pizza stone if using a grill.
13. Repeat the rolling process with the second portion of dough.
14. Spread half of the marinara sauce evenly over the surface of the first flatbread, leaving a small border around the edges.
15. Sprinkle half of the shredded mozzarella cheese over the sauce, followed by half of the feta cheese mixture, sliced cherry tomatoes, artichoke hearts, and red onion.
16. Sprinkle with dried oregano and drizzle with a little olive oil for added flavor.
17. Repeat the assembly process for the second flatbread.
18. If using an oven, place the baking sheet in the preheated oven and bake for 12-15 minutes, or until the edges are golden brown and the cheese is bubbly and melted.
19. If grilling, place the flatbread directly on the grill grates. Close the lid and grill for about 5-7 minutes, checking frequently to avoid burning. The flatbread is done when the cheese is melted and the edges are crispy.
20. Once cooked, remove the flatbreads from the oven or grill and let them cool for a minute.

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