Cook pasta according to package directions, reserving about 1 cup of cooking water before draining.
2.
Season chicken with salt, pepper, and garlic powder. Grill over medium-high heat for 12 minutes, turning frequently, until cooked through. Cut into strips.
3.
Add chicken to drained pasta along with pesto, peppers, tomatoes, and about 1/2 cup pasta cooking water (or more if desired). Toss to mix and coat.
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