**Season and cook the chicken**
In a skillet over medium-high heat, warm 1 tablespoon oil. Toss the diced chicken with chili powder, cumin, salt, and pepper. Add the seasoned chicken to the skillet and cook for 5–7 minutes, or until browned and cooked through (165°F/74°C internal temperature). Remove from heat and set aside.
**Prepare the street corn**
In the same skillet (wipe out any excess chicken bits if needed), add another tablespoon of oil or butter over medium heat. Stir in the corn and a pinch of salt, sautéing for 3–4 minutes if using fresh or frozen kernels (draining if canned). If you want extra color, let the kernels brown slightly.
**Make the creamy sauce**
In a bowl, whisk together the mayonnaise or sour cream, half of the lime juice, garlic powder (if using), and a dash of chili powder or smoked paprika. Adjust lime juice, salt, or spice to taste.
**Combine corn and sauce**
Remove the sautéed corn from heat and stir in the creamy sauce. Mix well to coat the kernels.
**Assemble the bowls**
Fill each bowl with a base of cooked rice. Top with cooked chicken and spoon the creamy street corn mixture over it. Sprinkle with Cotija cheese. Drizzle any remaining lime juice if desired. Garnish with chopped cilantro and optional toppings like jalapeños or avocado.
**Serve**
Enjoy immediately while warm.