Preheat the oven to 425 degrees F.
In a small bowl, combine the cumin, cayenne pepper, oregano, onion powder, garlic powder, salt and black pepper.
Toss the sweet potatoes with olive oil and the spice mixture on a sheet pan. Spread them into a single layer.
Roast the sweet potatoes for 25 minutes until they are just starting to brown at the edges, and they are tender in the middle.
Add the kale to the sheet pan and continue roasting for 5 minutes until the kale is crisp.
Stir the black beans and cilantro into the roasted sweet potatoes and kale.
Line a sheet pan with parchment paper. To assemble the quesadillas, place the tortillas on the baking sheet. Sprinkle cheese one half of each of the tortillas. Spoon the sweet potato-black bean filling on top. Then sprinkle with additional cheese. (You will need 1/4 cup cheese total for each quesadilla.) Fold over the tortillas, gently pressing them down.
Bake the quesadillas for 10-12 minutes flipping them over halfway through baking. They should be lightly browned with melted cheese.
Cut the quesadillas and top with chopped cilantro. Serve with salsa and lime wedges.