1 Preheat oven to 400 degree. 2 Peel oranges. Cut into 1/4 inch slices. Remove any seeds. 3 Place orange slices in a 2 quart square baking dish. 4 In a small bowl combine pecans and pumpkin pie spice. Sprinkle over orange slices. 5 Bake for 8 to 10 minutes or until heated through. Enjoy!