In a skillet, heat olive oil over medium heat. Add the shredded chicken, chili powder, cumin, garlic powder, onion powder, paprika, salt, and pepper. Stir to combine and cook for about 5 minutes, until heated through.

While the chicken is cooking, prepare the Avocado Lime Sauce. In a blender or food processor, combine the avocado, Greek yogurt, lime juice, minced garlic, and salt. Blend until smooth and creamy. Adjust seasoning if needed.

Warm the tortillas in a dry skillet or microwave until pliable.

To assemble the tacos, place a portion of the spiced chicken on each tortilla. Top with shredded lettuce, diced tomatoes, shredded cheese, and a dollop of sour cream.

Drizzle the Avocado Lime Sauce over the top of each taco. Serve immediately.