01 - Preheat grill to medium-high heat or set oven to broil setting.
02 - If using wooden skewers, soak them in water for 15 minutes to prevent burning.
03 - Thread chicken cubes, bell pepper, and onion pieces alternately onto skewers, distributing ingredients evenly.
04 - Brush the skewers evenly with teriyaki sauce. Season with salt and pepper if desired.
05 - Place skewers on preheated grill or lined baking sheet. Grill or broil for 12 to 15 minutes, turning halfway through, until chicken is fully cooked and edges are lightly charred.
06 - During the final minutes of cooking, brush skewers with additional teriyaki sauce for enhanced flavor.