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