01 - Rinse rice under cold water until clear. Combine rice, water, and salt in a saucepan. Bring to a boil, reduce heat to low, cover, and simmer for 15 minutes. Remove from heat and let stand covered for 5 minutes. Fluff with a fork before serving.
02 - Whisk together olive oil, chili powder, garlic powder, smoked paprika, cumin, salt, and black pepper. Coat chicken thoroughly with spice mixture. Grill or pan-sear over medium-high heat for 5 to 7 minutes per side until internal temperature reaches 165°F. Rest for 5 minutes before slicing.
03 - Heat 1 tablespoon 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 cool slightly. In a separate bowl, combine mayonnaise, sour cream, minced garlic, lime juice, and chili powder. Fold in charred corn, cotija cheese, and chopped cilantro.
04 - Divide prepared rice among 4 serving bowls. Arrange sliced chicken and street corn mixture over rice. Top with diced avocado, additional cilantro, and lime wedges. Serve immediately while warm.