Preheat the oven to 375°F. Line a baking tray with parchment paper and brush with oil.
To make the burgers, peel sweet potato and cut into wedges. Using the grating blade of a food processor, grate sweet potato. Add the black beans to the sweet potato and pulse once or twice to mix.
Add oat flour, herbs, garlic, peanuts, sesame oil, tamari, curry powder, chili powder, and cayenne to the food processor, and pulse to mix together, being careful not to over blend. Keep some of the chunkiness for texture. Taste and adjust seasonings, then let the mixture rest while you make the sauce.
To make the peanut sauce, whisk together all the sauce ingredients in a small bowl. Add a little water to thin and whisk to adjust consistency. Taste and adjust seasonings.
Shape the burger mixture into 6 to 8 patties and place on a baking tray. Patties should be approximately 3/4 inch thick. Place baking tray in the oven and bake for 20 to 25 minutes, till lightly browned and firm. Let cool for about 5 minutes. Serve with Peanut Sauce.