Preheat oven to 350 degrees F. Spray a baking sheet with cooking spray. Cut each pear in half, down the center. Carve out the core area, forming a small hole. Place pear halves open side up, onto prepared baking sheet.
Melt butter and then add to a mixing bowl with oats, brown sugar, cinnamon, vanilla and salt. Mix together until crumbly. Scoop an even amount into each pear.
Bake for 20-25 minutes, allowing pears to become tender.