In a small bowl, mix together the melted butter, honey, cinnamon, and vanilla extract until well blended.
Place the pear halves cut-side up in a baking dish.
Drizzle the honey cinnamon mixture evenly over each pear half, ensuring they are well coated.
Sprinkle the chopped walnuts over the pears for added crunch if desired.
Cover the baking dish with aluminum foil and roast in the preheated oven for 20 minutes.
After 20 minutes, remove the foil and bake for an additional 10-15 minutes, or until the pears are tender and caramelized, basting them once or twice with the syrup from the baking dish.
Remove from oven and let cool slightly before serving.
Notes
Serve warm on a platter, drizzled with syrup and garnished with fresh mint leaves.