Prepare the salad: Cook the farro according to the package instructions. Transfer to a large serving bowl.
While the farro cooks, prepare the dressing: In a small bowl or large liquid measuring cup, whisk together the oil, vinegar, salt, and pepper. Immediately pour over the farro while it is still warm. Toss to combine.
To the farro, add the edamame, green onions, and cranberries. Toss to combine, then sprinkle the feta over the top. Stir gently, just until the feta is incorporated. Taste and season with additional salt and pepper as desired. Enjoy immediately or refrigerate until ready to serve.
