Heat skillet over medium heat. Add tortilla, sprinkle with 1 tsp. brown sugar and ½ tsp. pumpkin pie spice. Layer with ¼ of apple slices. Fold in half and cook 3-4 minutes, or until lightly browned. Flip and cook additional 3-4 minutes, or until apples are softened.
Remove from heat and let cool before slicing. Repeat with remaining tortillas.