Add some farro to the bottom of each bowl. Arrange the mixed greens, cucumbers, tomatoes, hummus, spiced chicken slices, roasted sweetpotatoes and chickpeas, and pickled red onions in sections around the bowl. Top the hummus with a drizzle of olive oil. Sprinkle the salt over the hummus, cucumbers and tomatoes. Season the tomatoes with the black pepper. Sprinkle the feta cheese over the top of each bowl. Lastly, drizzle the vinaigrette over the top of each bowl.