In a nonstick skillet, heat 2 tablespoons of the oil. Arrange half of the dumplings in the skillet, pleated edge up. Cook over high heat until the bottoms are lightly browned, 2 minutes. Add 1/2 cup of water, cover and cook until the filling is cooked through, 5 minutes. Uncover and cook until the bottoms are well browned, 1 minute; transfer to a plate. Cook the remaining dumplings and serve.