Let's cook.
In a large bowl, combine the olive oil, lemon juice, oregano, garlic powder, salt, and black pepper. Whisk well to create the marinade.
Add the cubed chicken to the marinade, tossing to ensure all pieces are evenly coated. Cover the bowl and refrigerate for at least 15 minutes, or up to 2 hours.
If using wooden skewers, soak them in water for at least 30 minutes to prevent burning.
Preheat a grill or grill pan to medium-high heat.
Thread the marinated chicken, red onion pieces, and bell pepper pieces alternately onto the skewers.
Grill the skewers for 10-15 minutes, turning occasionally, until the chicken is cooked through and has nice grill marks. The internal temperature of the chicken should reach 165°F (74°C).
Remove from heat and serve immediately.
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