Black Bean Falafel Burgers with Quick Pickled Onions

Yes another falafel recipe. But come on, falafels are a vegetarian staple! You can make them with traditional chickpeas, mix it up with lentils, or in this case, go smoky southwest with black beans and chipotle. These falafels are made with black beans AND quinoa, so they pack a serious protein punch. Chipotle and cumin …