Popular in Northern Mexico and the United States, large flour tortillas are used as a base for this hearty pork and sweet potato filling. Top with shredded cheese before folding and cooking until golden and melty.
Preheat the oven to 200 degrees F. Pierce the sweet potato a few times with a fork and microwave until soft, 7 to 10 minutes. Let cool slightly, then remove the skin and mash the flesh with a fork; set aside.
Heat 1 tablespoon butter in a large nonstick skillet over medium-high heat. Add the pork, chile powder and 1 teaspoon salt and cook, breaking up the meat, until browned, about 3 minutes. Add the garlic, sweet potato and scallions and cook, stirring, 2 more minutes. Add the cilantro and season with salt. Transfer the mixture to a bowl.
Wipe out the skillet; add 1/2 tablespoon butter and melt over medium-high heat. Add a tortilla, spread one-quarter of the pork mixture on one half and top with 1/2 cup cheese. Fold the tortilla over the filling and cook until the quesadilla is golden, 1 to 2 minutes per side. Transfer to a baking sheet and place in the oven to keep warm. Repeat to make 3 more quesadillas. Cut into wedges and serve with pickled jalapenos and sour cream, if desired.