Add an additional 1/2 Tbsp olive oil to pan then add carrots, celery and onion and saute 3 minutes. Move veggies to the side, add garlic and saute 1 minute. Pour in chicken broth, oregano, basil, thyme, rosemary and season with salt and pepper to taste. Return chicken to pot and bring to a simmer. Add orzo and parmesan rind, reduce heat to medium-low, cover and simmer stirring occasionally, about 8 – 10 minutes or until chicken is cooked through (it should register 165 degrees in center on an instant read thermometer).