In a medium bowl, toss the cubed chicken with olive oil, chili powder, cumin, smoked paprika, garlic powder, and salt until evenly coated.
Heat a large skillet over medium-high heat and add the chicken, cooking for 8 to 10 minutes until browned and the internal temperature reaches 165 degrees Fahrenheit.
In a separate bowl, whisk together the mayonnaise, sour cream, and lime juice until smooth.
Fold the roasted corn kernels and half of the chopped cilantro into the cream mixture until well combined.
Distribute the cooked rice evenly among four serving bowls.
Layer the cooked chicken over the rice followed by the street corn mixture.
Garnish each bowl with crumbled cotija cheese, the remaining cilantro, and a sprinkle of Tajin seasoning before serving.