First, cook the sweet potato. You can do this in advance to save time. The total time for the recipe does not include the time it takes to cook the sweet potato, so keep that in mind. To bake the sweet potato, preheat the oven to 400 degrees F/204 degrees C. Scrub and wash the sweet potato, and then poke several holes in it with a fork. Place the potato on a foil-lined baking sheet on the center rack of the oven, and cook for 45 to 60 minutes or until tender. You can also make a Microwave Sweet Potato. It's helpful to let the sweet potato cool so that it holds the burgers together better. If you have the time, let it cool (this is another reason I recommend prepping in advance). Change the oven temperature to 375 degrees F/190 degrees C. Line a baking sheet with parchment paper.
Peel, scoop out, and measure the sweet potato flesh. Add it to a large mixing bowl with the black beans. Use the back of a fork or a potato masher to gently mash the beans into the potato.
Add the breadcrumbs, green onions, cilantro, garlic, cumin, paprika, salt, pepper, and apple cider vinegar. Mix until well-combined.
Scoop out ½ cup of the mixture. It's helpful to use a ½ cup measuring cup if you have one. Use your hands to form into a burger about 3 to 4 inches wide and ½-inch thick. Place on the lined baking sheet and repeat until you have 4 burgers.
Bake for 30 to 40 minutes, carefully flipping halfway through, until golden brown. Let cool on the baking sheet for 5 to 10 minutes.
Serve on a bun if desired and with your toppings of choice.
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