1.Preheat your oven to 350 degrees F. Spray the bottom of a 9 X 13 baking dish with cooking spray. In a small bowl, whisk together the butter, vanilla, and cinnamon then set aside.
2.Peel the pears, halve and core them. Leave the stems on - they make for a pretty presentation. Rub the lemon wedge over the pear to prevent browning.
3.Brush the pears with the mixture made earlier on both sides. Arrange the pears in the prepared baking dish, cut side down. Bake them until fork-tender, about 30 minutes per side, basting every 15 minutes with the pan juices.
4.Brush the pears one last time with the pan juices and serve warm. You may serve it with a side of whipped cream.