In a small mixing bowl, combine the cooked shredded chicken, Greek yogurt, and ranch seasoning powder until well mixed.
Heat the olive oil in a non-stick skillet over medium heat.
Place the tortilla in the skillet and distribute half of the cheese over the entire surface.
Spread the chicken ranch mixture onto one half of the tortilla and top with green onions.
Sprinkle the remaining cheese over the chicken mixture and fold the tortilla in half.
Cook for 3 to 4 minutes per side until the tortilla is golden brown and the internal cheese is fully melted.
Remove from heat and allow to rest for 60 seconds before slicing into three wedges.