Gather all ingredients. Grill chicken in grill pan on stove top. 9 minutes one side and 8 on the other. I usually do bone in, it has more flavor. Take off heat, cover with lid (make sure chicken is cooked thru).
Boil rotini in 6 quarts of salted water, 17 minutes, strain, set aside. Take cooled chicken breast and cube or shred.
In large bowl mix together pasta and chicken, carrot, bell pepper, onion, broccoli florets and tomatoes. In seperate bowl mix all remaining ingredients and fold into chicken, pasta mixture. Cover and chill at least 2 hours in fridge. Taste even better the next day.
NOTE: Make sure tomatoes are seeded well or it makes for watery pasta.