Mix the Batter: In a medium bowl, whisk together the chickpea flour, warm water, 2 tablespoons olive oil, and salt until smooth. Let the batter rest at room temperature for 30 minutes.
Preheat the Oven and Skillet: Preheat the oven to 450°F. Place an 8-inch cast iron skillet in the oven while it preheats.
Add Oil and Batter: Carefully remove the hot skillet from the oven. Add ¼ cup olive oil, swirling to coat the bottom evenly. Immediately pour in the batter and tilt the pan so it spreads evenly.
Bake: Return the skillet to the oven and bake for 20–25 minutes, until the edges are crispy and the center is set.
Serve: Cut into wedges, sprinkle with freshly ground black pepper, and serve hot.