01 - Rinse rice under cold water until water runs clear. Combine rice, water, and salt in a saucepan. Bring to boil, reduce heat to low, cover, and simmer 15 minutes. Remove from heat and let steam covered 5 minutes. Fluff with fork.
02 - Whisk together olive oil, chili powder, smoked paprika, cumin, garlic powder, salt, pepper, and lime juice in a bowl. Add chicken breasts and coat evenly. Let marinate at least 10 minutes.
03 - Heat grill pan or skillet over medium-high heat. Grill chicken 5 to 7 minutes per side until cooked through and juices run clear. Rest 5 minutes, then slice against the grain.
04 - Heat olive oil in skillet over medium-high heat. Add corn kernels and sauté 3 to 5 minutes until slightly charred. Stir in smoked paprika, chili powder, and salt. Remove from heat.
05 - Whisk together sour cream, mayonnaise, lime juice, hot sauce if using, and salt until smooth and creamy. Adjust seasoning to taste.
06 - Divide rice among four bowls. Top each with sliced chicken, street corn, drizzle of crema, crumbled cheese, cilantro, jalapeño slices if desired, and a lime wedge. Serve immediately.