Preheat oven to 400 degrees.
Line a large rimmed baking sheet with foil.
Arrange chicken and veggies on baking sheet.
Boil the orzo pasta, drain, then set aside.
Combine ingredients for dressing and whisk well; pour over chicken and veggies on baking sheet.
Bake for 20-25 minutes or until potatoes are tender.
Remove from oven and mix with prepared orzo pasta in a big bowl add olive oil if needed and sprinkle with feta cheese before serving (cheese is optional)