Preheat a waffle iron and prepare your desired toppings.
In a large bowl, whisk together the chickpea flour, baking powder, coriander, cumin, salt, cayenne (if using) and several grinds of pepper. Add the water, olive oil, cilantro, scallions and garlic and stir until combined.
Scoop ½ cup of batter for each waffle into a large Belgian waffle maker, or scoop an appropriate amount for your waffle maker.
Cook for 4 to 9 minutes, or until golden brown and lightly crisp. The timing will depend on your waffle iron. I like to cook these savoury waffles longer than sweet waffles to get them crisper.
Serve with desired toppings.