In a medium bowl, combine the mayonnaise, sour cream, lime juice, and half of the cotija cheese. Mix well and set aside.
Season the chicken breasts with olive oil, chili powder, cumin, garlic powder, onion powder, salt, and pepper. Grill or pan-sear the chicken over medium-high heat for about 6-7 minutes per side, or until fully cooked. Remove from heat and let it rest for 5 minutes before slicing.
In a skillet, add the corn and sauté over medium heat for about 3-4 minutes until heated through and slightly charred. Season with salt and pepper.
To assemble the bowls, divide the cooked rice among four bowls. Top each bowl with sliced chicken, sautéed corn, a generous dollop of the creamy sauce, avocado slices, remaining cotija cheese, and chopped cilantro.
Serve with lime wedges on the side for an extra burst of flavor.