In a medium bowl, combine the chicken strips with chili powder, cumin, paprika, olive oil, salt, and pepper. Mix well and let it marinate for at least 15-20 minutes for enhanced flavor.
Heat a large skillet over medium-high heat. Add the marinated chicken to the skillet and cook for about 5-7 minutes, or until the chicken is fully cooked and golden brown. Remove from the skillet and set aside.
In the same skillet, add the sliced bell pepper and onion. Sauté for about 3-4 minutes until the veggies are tender but still crisp. Season with a little salt and pepper.
Add the cooked chicken back into the skillet with the sautéed veggies. Stir in the black beans and corn, and cook for an additional 2 minutes until everything is heated through.
In serving bowls, place a generous scoop of cooked rice as the base. Top with the chicken and veggie mixture, then add diced avocado on top.
Finish with fresh cilantro and a squeeze of lime juice for a fresh taste. Serve with lime wedges on the side for additional flavor.