Steps
1. Cut the chicken breast into bite-sized pieces.
2. In a bowl, mix together the ketchup, olive oil, garlic powder, salt, and pepper to create the marinade.
3. Add the chicken pieces to the marinade, ensuring they are well coated, and let sit for 15 minutes.
4. Preheat a grill or grill pan over medium heat.
5. Assemble the skewers by alternating chicken pieces, bell pepper chunks, and onion chunks.
6. Grill the skewers for about 10-12 minutes, turning occasionally, until the chicken is cooked through and has nice grill marks.
7. Serve hot, drizzled with any leftover ketchup if desired.