Sweet Potato and Black Bean Veggie Burgers with Avocado Mayo 30-Apr-201715-Jun-2017 by Karen Dooley "kiwithetattooedlady", posted in DIY/How To, healthy food, meatless, quick hacks, snacks and sides, weight loss Sweet potatoes. Black beans. Quinoa. These veggie burgers are amazing; they're easy, they freeze well and duh. Tasty!