Preheat oven to 400°F. Line a baking sheet with foil or parchment paper. Use a fork to poke several holes into the sweet potato and set on the baking sheet. Roast 40-50 minutes, or until easily pierced with a fork.
Allow potato to cool almost completely. Scrape the sweet potato flesh out of the skin and use a fork to mash it in a bowl. Add chili powder, cumin, and paprika, and stir to combine. Add salt to taste.
Divide mashed sweet potato among tortillas. Spread ~2 Tablespoons to cover the entire tortilla, leaving a small border around the edge. Sprinkle ¼ cup shredded cheese on one half of the tortilla. Top with black beans, then fold.
Brush griddle or skillet with oil or butter. Once butter is melted, add quesadilla. Cook until golden brown and toasty on one side and cheese is partially melted, 2-3 minutes. Carefully flip and cook on the other side for another 2-3 minutes or until tortilla is golden brown and toasty on both sides and cheese is melted.
Remove quesadilla carefully from pan. If cutting, allow to cool slightly. Serve with condiments to YOUR taste. Enjoy!