Prepare rice, chicken and corn as desired and set aside.
In a small bowl, whisk together the mayonnaise, sour cream, lime juice, chili powder, garlic powder, and salt until smooth.
Divide the cooked rice evenly among 4 serving bowls.
Top each bowl with sliced grilled chicken and grilled corn kernels.
Sprinkle the cotija cheese, cilantro, red onion, and jalapeño evenly over the bowls.
Drizzle the prepared dressing over each bowl just before serving.
Garnish with additional cotija cheese, cilantro, and lime wedges if desired.