01 - Rinse the rice under cold water until the water runs clear. Combine rice, water, and salt in a saucepan. Bring to a boil, reduce heat, cover, and simmer for 15 minutes or according to package instructions. Remove from heat and let stand, covered, for 5 minutes. Fluff with a fork before serving.
02 - In a bowl, mix olive oil, chili powder, garlic powder, smoked paprika, cumin, salt, and pepper. Coat chicken thoroughly with the spice mixture. Grill or pan-sear chicken over medium-high heat for 5 to 7 minutes per side, or until internal temperature reaches 165°F. Let rest for 5 minutes, then slice into strips.
03 - Heat 1 tbsp olive oil in a skillet over high heat. Add corn kernels and cook, stirring occasionally, until charred in spots, approximately 5 minutes. Remove from heat and let cool slightly. In a separate bowl, combine mayonnaise, sour cream, garlic, lime juice, and chili powder. Stir in charred corn, cotija cheese, and chopped cilantro until well combined.
04 - Divide cooked rice among 4 serving bowls. Arrange sliced chicken on top of rice. Spoon street corn mixture over chicken and rice. Garnish with diced avocado, extra chopped cilantro, and lime wedges. Serve immediately while warm.