1. Set the oven at 325 degrees. Line a 9-inch square baking dish with parchment paper or aluminum foil. Set aside.
2. To prepare the shortbread crust, take a small mixing bowl and stir together the butter, sugar, vanilla, salt and cinnamon.
3. Add the flour to the butter mixture and stir until fully incorporated. Press shortbread dough into the bottom of the prepared baking dish.
4. Bake in the oven for 12 minutes, or until lightly browned. Begin to prep the pears while the crust bakes. You want the crust to be under-baked. Remove from the oven, leave the oven on and set aside, keeping the crust in the pan.