In a large skillet, toast the cumin seeds and coriander seeds over medium-low heat for 2 minutes until fragrant. Transfer to a mortar and pestle and grind to a coarse texture. In a food processor, add the chickpeas, fava beans, onion, garlic, green chilies, ground spices, parsley, cilantro, baking soda, salt, and black pepper.
Pulse 5 or 6 times, until the mixture is broken down and just combined. Don’t overmix, as we’re not trying to create a hummus. Once the texture of the dough looks like it’s sticking together when pressed between two fingers, transfer to a mixing bowl, add the bread crumbs, and mix.
Give it a taste—it should taste herby, spicy, and garlicky. Add more salt if necessary.
Using a mini scooper, scoop one ball and roll and slightly press down to form a small patty. Repeat with the rest of the dough. Place the patties on a parchment-lined cookie sheet and set in the refrigerator for at least 15 minutes, until firm.