A delicious, colorful, no-fuss Chinese meal made at home that rivals your favorite take-out! Be sure to get everything ready first, then cook.
Combine flour, garlic powder, salt, and pepper in a shallow dish or paper bag. Toss chicken in flour mixture to coat.
Heat 3-4 tablespoons oil in a skillet over medium-high heat. Add chicken; cook and stir until no longer pink in the center and the juices run clear, 8 to 10 minutes. Transfer to a plate.
Heat the remaining 1-2 tablespoons oil in the same skillet over medium heat. Add the celery, bell peppers, and onion; cook and stir until slightly tender, about 5 minutes.