01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - Scrub sweet potatoes and pierce each several times with a fork. Place on the prepared baking sheet and bake for 40 to 45 minutes until tender when pierced with a fork.
03 - Allow sweet potatoes to cool slightly. Cut each in half lengthwise, then scoop out most of the flesh, leaving approximately a 1/4-inch border to maintain sturdy skins. Reserve the flesh for other uses.
04 - Raise oven temperature to 425°F. Arrange sweet potato skins cut side up on the baking sheet.
05 - In a medium bowl, mix black beans, corn, red bell pepper, sliced green onions, cumin, smoked paprika, chili powder, salt, and black pepper until well combined.
06 - Spoon the black bean mixture evenly into the prepared sweet potato skins. Sprinkle the shredded cheese on top.
07 - Bake for 10 to 12 minutes until the cheese is melted and the skins are crisp.
08 - Remove from oven and allow to cool briefly. Top with sour cream or Greek yogurt, diced avocado, chopped cilantro, and additional sliced green onions. Serve with lime wedges if desired.