Split the edamame pods and release the beans into a bowl. Discard the pods. Stir together the oil, basil, chile powder, onion salt, cumin, paprika and black pepper in a small bowl. Drizzle the mixture over the beans and toss to coat. Arrange the beans in a single layer in a shall baking dish. Roast, uncovered, at 375 degrees for 12 to 15 minutes, stirring once, until the beans begin to brown. Serve hot as a vegetable side dish or cooled as a snack. Refrigerate any leftovers.