01 -
Heat butter or olive oil in a medium skillet over medium heat. Add diced peaches and sauté for 2 to 3 minutes until softened and juices are released. Stir in sliced red onion and continue to cook for 1 minute. Remove from heat and set aside.
02 -
Lay one tortilla flat on a work surface. Sprinkle half of the cheese evenly over the tortilla. Distribute half of the peach and onion mixture over the cheese. Top with a tablespoon of chopped cilantro and place another tortilla on top.
03 -
Transfer the assembled quesadilla to a large nonstick skillet over medium heat. Cook for 2 to 3 minutes per side, pressing gently with a spatula, until the tortilla is golden brown and the cheese has melted. Repeat with remaining ingredients to form the second quesadilla.
04 -
Remove quesadillas from the skillet and let them rest for 1 minute. Slice each quesadilla into quarters and serve warm.