Heat the avocado oil in a cast-iron skillet over medium-high heat.
Coat the chicken breast evenly with taco seasoning on both sides.
Place the chicken into the hot skillet and cook undisturbed for about 5 minutes until a golden crust develops.
Flip the chicken using tongs and cook for another 4–5 minutes, reducing the heat slightly if needed, until the internal temperature reaches 165°F (74°C).
Remove the chicken from the skillet and let it rest for at least 5 minutes before slicing.
In a large serving bowl, arrange the chopped romaine lettuce.
Add the cherry tomatoes, black beans, corn, black olives, bell pepper, jalapeño, shredded cheese, guacamole, sour cream, cilantro, and tortilla strips.
Top with the sliced chicken.
Drizzle the Southwest Salad with Cilantro Lime Dressing generously with cilantro lime dressing.
Serve immediately while the vegetables are crisp and fresh.