01 - Set oven to 425°F and line a baking sheet with parchment paper.
02 - In a large bowl, combine diced sweet potatoes, red onion, and bell pepper with olive oil, salt, and pepper. Spread evenly on the baking sheet and roast for 20 to 25 minutes, stirring halfway, until tender and caramelized.
03 - In a mixing bowl, gently fold together the roasted vegetables, black beans, shredded cheese, cilantro if desired, cumin, smoked paprika, and chili powder.
04 - Lay out tortillas. Spread onequarter of the filling over half of each tortilla and fold over to enclose.
05 - Heat a large non-stick skillet over medium heat and lightly grease with oil or cooking spray. Cook two quesadillas at a time for 2 to 3 minutes per side until golden brown and cheese is melted.
06 - Slice into wedges and serve hot, optionally accompanied by salsa, sour cream, or guacamole.