*Chickpea Note: If using chickpeas you've cooked yourself from dry, they can sometimes have less moisture and therefore make the blended mix too dry. If it is not coming together before adding the oats, is too crumbly, add a smidgen of water - a teaspoon at a time until it just comes together. With canned chickpeas, you should not need to add extra water.
In a food processor, combine the chickpeas, parsley, cilantro, onion, celery, lemon juice, vinegar, garlic, and spices, and process until the mixture is well incorporated and starting to smooth out, scraping scrape down the sides of the bowl as needed. Then add the oats and pulse a few times to work them in. Refrigerate the mixture for 30 minutes if possible (refrigerating will make it firmer and easier to shape).
Take small scoops of the mixture, 11⁄2 to 2 tablespoons (using a cookie scoop is helpful, but you can use your hands, rinsing when needed to keep the mixture from sticking to your palms) and form into balls. Once finished, place the seasoned millet flour in a bowl. Add the falafel balls to the bowl and lightly toss, then toss a moment in your hand to remove any excess clumping of flour.
Prepare a nonstick skillet over medium or medium-high heat (prepare surface with spray/wipe of oil, or use a good non-stick). Place the falafel balls in the pan, flattening them slightly with a spatula, and cook for 6 to 9 minutes on each side, until golden brown and crisped on the outside, working in batches, if needed. Serve. Makes 20-24 patties.