In a medium bowl, combine the chicken cubes with minced chipotle peppers, cumin, garlic powder, salt, and pepper; marinate for at least 15 minutes.
Heat 1 tablespoon of olive oil in a large skillet over medium-high heat. Add the chicken and cook for 8-10 minutes or until the internal temperature reaches 165 degrees Fahrenheit.
In a separate small pan, heat the remaining olive oil and sauté the corn and black beans until warmed through, about 5 minutes.
Prepare the creamy sauce by whisking together sour cream, mayonnaise, lime juice, and cilantro in a small mixing bowl.
Assemble the bowls by placing 0.5 cup of rice in each of four bowls.
Top each bowl with equal portions of the cooked chicken, black bean and corn mixture, and sliced avocado.
Drizzle the prepared creamy sauce over each bowl and serve immediately.