01 - Combine rice, water, and salt in a medium saucepan. Bring to a boil, reduce heat to low, cover, and simmer for 15 minutes until water is absorbed. Remove from heat and let stand covered for 5 minutes. Fluff with a fork before serving.
02 - Whisk together olive oil, chili powder, smoked paprika, garlic powder, cumin, salt, black pepper, and lime juice in a bowl. Coat chicken breasts evenly with the marinade. Allow to marinate for at least 10 minutes at room temperature.
03 - Preheat a grill pan or skillet over medium-high heat. Grill marinated chicken breasts for 6 to 7 minutes per side until fully cooked and juices run clear. Transfer to a cutting board and let rest for 5 minutes before slicing into strips.
04 - Heat a skillet over medium-high heat. Add corn kernels and cook for 3 to 4 minutes until lightly charred. Remove from heat and transfer to a mixing bowl. Stir in mayonnaise, sour cream, cotija cheese, chili powder, lime juice, cilantro, salt, and pepper until well combined.
05 - Divide cooked rice evenly among three serving bowls. Arrange sliced chicken, street corn mixture, avocado slices, and diced red onion on top of each bowl. Garnish with additional cilantro and serve with lime wedges on the side.