Preheat the oven to 350 degrees F. Put the sweet potatoes on a parchment-lined baking sheet and bake until soft when pierced with a fork, about 1 hour. Let cool for 15 minutes.
Slice the potatoes in half lengthwise and scoop out most of the flesh into a bowl. Brush the empty potato skins with the olive oil and season with salt and pepper. Return the skins to the baking sheet and bake until crispy, about 15 minutes.
Meanwhile, add the beans to the bowl with the sweet potato flesh; add the cumin, chili powder, scallions and jalapeño and mix. Season with salt and pepper.
Remove the potato skins from the oven and fill with the bean mixture. Fit a baking sheet with a wire rack. Transfer the filled potato skins to the rack and bake until warmed through and slightly browned on top, another 20 minutes.
Meanwhile, blend the sour cream, lime juice and avocado in a food processor until smooth. Season with salt and pepper. Set aside.
Heat a medium skillet over medium-high heat. Add the chorizo and cook, stirring to break up the meat, until browned and crispy, 8 to 10 minutes. Drain off the fat. Top the potato skins with the warm crispy chorizo, avocado-sour cream drizzle and sliced scallion greens.