Using a 2½-inch circle cookie cutter (or a glass with a 2½-inch circumference and a small knife), cut 3 circles from each tortilla.
In a medium bowl, toss together the pear slices, lemon juice, cinnamon, nutmeg, dried cranberries and hazelnuts.
On one half of each tortilla circle, layer one pear slice, on piece of Brie and a couple of cranberries and hazelnut pieces. Fold over the tortillas to form half-circles.
Heat a large skillet over medium heat. Place several quesadillas in the pan and cook until the tortillas are golden brown, 2 to 3 minutes per side.