Cook pasta according to directions. STAY CLOSE & WATCH. This pasta cooks in just minutes! Drain, rinse in cold water and set aside.
In large skillet, saute onion in medium-hot oil 3-5 minutes to soft-crisp stage. Add garlic and chicken, lowering heat to medium. Continue to cook until chicken is done. Stir frequently so garlic is just light brown and not burnt.
Add tomatoes, olives, vinegar. Stir.
Return pasta, along with chives, to pan, to heat.
Toss to dress pasta.
Season to taste with salt and pepper.
This can now be served hot or allowed to chill and serve as a cold pasta salad.