In a large bowl, whisk together the chickpea flour, salt, garlic, parsley, cilantro, cumin, coriander, chili powder, lemon juice, 2 cups water, and 6 tablespoons of the olive oil. Let the mixture soak for 30 to 60 minutes to hydrate the flour.
Preheat the broiler with the rack in the center position.
Place a 10-inch cast-iron skillet in the oven to heat up, about 5 minutes. Carefully remove the pan. Swirl in 1 tablespoon of oil to coat the bottom, then pour in half the batter. Tilt the pan until the batter is evenly spread. Return the pan to the oven and broil for 5 to 15 minutes, until the edges are brown and toasty (broilers tend to vary widely in heat/temperature from oven to oven).
Remove the pan from the oven and gently slide the flatbread onto a plate. Repeat with the remaining batter to make a second flatbread.
Smear the flatbreads with yogurt and top with desired toppings and dollops of the muhammara, if desired. Drizzle with olive oil and season generously with salt and pepper.