Preheat oven to 400 degrees.
Grease a 9 inch round pan.
In a bowl, combine the chicken, ranch dressing, and cheese.
Unroll crescent dough sheet and spread chicken mixture evenly on top.
Starting with the long side, roll up dough.
Pinch seam to seal tightly.
Using a sharp knife, cut roll into 8 equal slices.
Place slices into greased pan.
Place pan into oven and bake 18-20 minutes.
Once baked through, remove from oven and allow to cool a few minutes before serving.
Serve with additional Ranch dressing if desired.