Soak the chickpeas. Add the dried chickpeas to a large bowl and cover with plenty of cold water. Soak in the refrigerator for at least 8 hours or up to 24 hours. Drain very well and pat dry lightly if they seem wet.
Preheat the oven.Preheat the oven to 400°F. Add 1/4 cup olive oil to a large rimmed baking sheet and spread it around evenly.
Make the falafel mixture.In a food processor, combine the drained chickpeas, onion, garlic, parsley, cilantro, salt, pepper, cumin, coriander, baking powder, lemon juice, and remaining 1 tablespoon olive oil.
Pulse to the right texture.Pulse until the mixture looks finely chopped and holds together when pressed between your fingers. It should look like small crumbly bits, not smooth like hummus. Scrape down the sides as needed.If the mixture seems too dry to hold together, add 1 tablespoon water and pulse again. Add the second tablespoon only if needed.
Rest the mixture.Let the mixture sit for 15 to 20 minutes, or refrigerate it for 20 to 30 minutes if it feels soft. This helps it firm up and makes shaping easier.
Shape the falafel.Scoop about 2 tablespoons of mixture and shape into patties about 2 inches wide and 1/2 inch thick. Press firmly so they hold together well. Place on the oiled baking sheet.
Bake.Bake for 15 minutes. Carefully flip each falafel, then bake another 10 to 15 minutes, until both sides are deep golden brown and the edges look crisp.
Serve.Serve warm with pita, tahini sauce, hummus, chopped salad, or in a grain bowl.