Using the small holes on a cheese grater, shred the sweet potato.
Place the sweet potato in a bowl with the drained black beans. Using the back of a fork, mash the beans with the sweet potato.(If preparing at home, the above steps can be done in a food processor with a grater attachment).
Once you have a fairly smooth mixture, add the egg and the spices and stir to incorporate.
Add the panko and stir to combine with the bean and sweet potato mixture. Set aside for 10 minutes.
To form the patties, take about ¼ cup of the mixture and form a ball, pressing the mixture together with your hands. Flatten the ball into a patty about 3/4 inch thick. Set aside and repeat with the rest of the mixture to form 6 patties total.
Heat a teaspoon of oil in a skillet. Once hot, add the patties and cook 4-5 minutes on each side until the outside is crisp and the inside is cooked through but still tender. Grill the buns, if desired.
To serve, spread spicy mayo on the buns, then layer in the burger patty, avocado, and any other toppings or condiments you enjoy.
*Nurtition info is per burger patty, without the bun or any toppings.
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