Season chicken cubes with chili powder, smoked paprika, salt, and pepper.
Heat olive oil in a large skillet over medium-high heat; sear chicken until browned and internal temperature reaches 165 degrees Fahrenheit, approximately 8-10 minutes.
In a separate dry cast-iron skillet or the same skillet after removing chicken, char corn kernels over high heat until blackened in spots, approximately 5 minutes.
In a small mixing bowl, whisk together mayonnaise, sour cream, and lime juice until smooth.
Divide cooked rice into four bowls and top each with equal portions of cooked chicken and charred corn.
Drizzle the dressing over each bowl and garnish with crumbled cotija cheese and chopped cilantro.