Easy Sweet Potato Veggie Burgers! With Avocado | Crave a veggie burger. One with Panko-crusted edges - infused with tender sweet potato and creamy, rustic white beans. Tall stacked on a toasted grain bun - crisp romaine leaves sprawling out the sides. Lime green avocado. Dijon. Pepper. Zesty onion. These Sweet Potato Tahini Bean Burgers are super easy to make.