Preheat the oven at 400°F. Use convection bake for best results.
Wash the sweet potatoes and poke 5-8 holes in each. Place them in the oven, directly on the rack. Place a baking sheet lined with parchment paper on a lower rack to collect the drippings from the potatoes.
Take the potatoes out of the oven, let them cool a bit and peel them. Set the oven to 375°F (convection bake).
Add the peeled sweet potatoes, drained beans, chopped onion, oats and spices to the bowl of a stand mixer and mix on the lowest speed until an homogeneous paste forms.
Form the paste into burger shape and place them on a baking sheet lined with parchment paper.
Bake the SpOBB burgers for 30 minutes.
SpOBB sauce (optional)
Mix all the SoBB ingredients.
Notes
Spread SoBB sauce (optional) on the whole-wheat bun and enjoy the burger with your favorite toppings.