Juicy grilled chicken kabobs are packed with colorful bell peppers and red onion, then flavored with a zesty fajita-inspired marinade of lime, olive oil, and warm spices. Marinate the chicken ahead of time, thread everything onto skewers, and grill until tender and perfectly cooked.
Cut the bell peppers and red onion into 1-inch pieces. Cut the chicken breast into 1-inch pieces and place it in a large covered bowl or gallon-sized resealable bag.
In a small bowl, stir together the oregano, cumin, garlic powder, cayenne pepper, black pepper, and salt.
Add the olive oil, lime juice, and spice mixture to the chicken. Toss or seal and shake to coat evenly, then refrigerate for at least 1 hour.
When ready to grill, thread the chicken, bell peppers, and onion onto skewers, alternating between chicken and vegetables. Leave about 2 inches of each skewer exposed for holding. If desired, lightly brush the vegetables with a little extra oil to help keep them tender.
Cook the skewers on a hot grill over indirect, medium heat for 10 to 15 minutes, turning them halfway through. The chicken is ready when it is cooked through, no longer pink inside, and reaches 165°F (74°C) on an instant-read meat thermometer.
Remove the kabobs from the grill and serve while hot.