In a food processor, combine the chickpeas, garlic, cumin, ½ teaspoon salt, and ¼ teaspoon pepper, and pulse until finely chopped. My food processor struggles with this a bit, so I add about 1 tablespoon of olive oil to make it run smoother. Scrape down the sides of the bowl as necessary and transfer contents to a large bowl. Then chop the Swiss chard in the food processor and add to the chickpea mixture, along with the feta, herbs, and flour. Mix until combined. Form the mixture into eight 2½-inch patties.