Season the Chicken: In a small bowl, combine chili powder, smoked paprika, cumin, garlic powder, onion powder, cayenne pepper, salt, and pepper. Rub the seasoning evenly over both sides of the chicken breasts.
Cook the Chicken: Heat olive oil in a skillet or grill pan over medium heat. Cook the chicken for 5-6 minutes per side, or until fully cooked and the juices run clear. Remove from heat and let it rest for 5 minutes before slicing into thin strips.
Prepare the Dressing: In a small bowl, whisk together Greek yogurt (or sour cream), lime juice, olive oil, honey, chili powder, cumin, smoked paprika, garlic, salt, and pepper. Mix until smooth. Adjust seasoning as needed.
Assemble the Salad: Arrange the mixed greens in a large serving bowl or on individual plates. Layer with cherry tomatoes, black beans, corn, avocado slices, shredded cheddar cheese, and red onion. Top with the sliced chicken.
Drizzle & Serve: Pour the Southwest dressing over the salad and gently toss to coat. Garnish with tortilla strips for an extra crunch if desired. Serve immediately and enjoy!