01 - Rinse rice under cold water until water runs clear. Combine rice, water, and salt in a saucepan. Bring to a boil, reduce heat to low, cover tightly, and simmer for 15 minutes or according to package directions. Remove from heat and let stand covered for 5 minutes. Fluff gently with a fork before serving.
02 - Combine olive oil, chili powder, garlic powder, smoked paprika, cumin, salt, and pepper in a bowl. Coat chicken thoroughly with the spice rub. Grill or pan-sear over medium-high heat for 5 to 7 minutes per side until internal temperature reaches 165°F. Let chicken rest for 5 minutes, then slice against the grain into strips.
03 - Heat 1 tablespoon olive oil in a large skillet over high heat. Add corn kernels and cook, stirring occasionally, until charred and lightly browned in spots, approximately 5 minutes. Remove from heat and allow to cool slightly. In a separate bowl, whisk together mayonnaise, sour cream, minced garlic, lime juice, and chili powder. Fold in charred corn, cotija cheese, and chopped cilantro until evenly combined.
04 - Divide cooked rice evenly among 4 serving bowls. Arrange sliced chicken over the rice. Top with street corn mixture, diced avocado, additional fresh cilantro, and lime wedges. Serve immediately while warm.