Prepare the Chicken: Mix salt, pepper, chili powder, cumin, paprika, garlic powder, and onion powder in a small bowl. Rub the seasoning on both sides of the chicken. Heat olive oil in a large skillet over medium-high heat. Cook the chicken for 6-7 minutes per side, until it reaches 165°F (75°C). Let it rest, then shred using two forks.
Cook the Rice: Cook the rice according to package instructions. Fluff with a fork and set aside.
Make the Sauce: In a small bowl, mix Greek yogurt (or sour cream), hot sauce, lime juice, garlic powder, cumin, and salt. Stir until smooth.
Assemble the Bowl: Divide the rice among serving bowls. Top with shredded chicken, black beans, corn, diced tomatoes, red onions, and avocado. Sprinkle with shredded cheese and chopped cilantro. Drizzle with the sauce and add a dollop of sour cream if desired. Serve with lime wedges.