To bake these dumplings, preheat the oven to 400ºF. Brush two baking sheets with a thin layer of oil. You don’t need to line them with parchment paper. Place the dumplings on the baking sheets. Spray the tops of the dumplings with cooking spray. I prefer using cooking spray because it coats oil over the exterior of the dumplings more quickly and evenly than brushing the dumplings with oil. Bake the dumplings for 10 to 12 minutes. Keep an eye on the dumplings at around 10 minutes and check to see if the tops of the dumplings have browned. You want them to be a nice deep golden brown color.