In a small mixing bowl, combine shredded chicken, Greek yogurt, ranch seasoning, and hot sauce until well incorporated.
Heat a non-stick skillet over medium-low heat and coat with olive oil.
Place the tortilla flat in the skillet for 30 seconds to soften.
Spread the chicken mixture evenly over one half of the tortilla.
Sprinkle the cheese and green onions over the chicken mixture.
Fold the empty half of the tortilla over the filling to create a half-moon shape.
Cook for 3 to 4 minutes on the first side until golden brown and crispy.
Carefully flip the quesadilla and cook for an additional 3 minutes until the cheese is fully melted.
Transfer to a cutting board, allow to rest for 60 seconds, and slice into three triangles.