Add the chicken chunks, sliced red onion, and sliced bell peppers to a large rimmed sheet pan. Toss with the olive oil and sprinkle on the garlic powder, paprika, onion powder, chili powder, cumin, salt, and pepper. Toss to coat the chicken and vegetables in the spices. Spread the chicken, onions, and peppers into a single layer across the sheet pan. Place the halved lime on the sheet pan.