Combine all ingredients for the dressing in a blender or shaker cup. Blend or shake to combine. Set aside.
Cook pasta according to package directions. Drain. Combine pasta, olives, tomatoes, capers, parsley, and artichokes in a large bowl. Stir well. Pour dressing over pasta; stir well. Top with sliced chicken (if using), and feta.
Preheat grill to medium heat. Sprinkle both sides of chicken with salt and pepper. Grill 3-4 minutes per side or until chicken is no longer pink and juices run clear.
For gluten free, use whole grain gluten free noodles (such as brown rice pasta).For dairy free, omit cheese.For vegetarian, omit chicken.For vegan, omit chicken and cheese.