Heat oil in a skillet over medium heat.
Fry the tortilla triangles until golden and crispy, about 3-4 minutes.
Remove chips and drain on paper towels.
In the same skillet, add salsa and heat until simmering.
Add the crispy tortillas to the salsa, stirring gently to coat.
If using, add shredded chicken and mix well.
Cook for an additional 2-3 minutes until heated through.
Transfer to a serving plate and drizzle with sour cream.
Top with avocado slices and queso fresco.
Garnish with cilantro and serve with lime wedges.