Preheat your oven to 400°F (200°C) and prepare your baking pan by spraying it with cooking spray.
Mix the filling: In a mixing bowl, combine the cooked rotisserie chicken, ranch dressing, and shredded Italian cheese blend. Stir until everything is well incorporated.
Prepare the dough: Open the can of crescent dough and unroll it onto a clean surface.
Spread the filling: Evenly spread the chicken mixture over the dough, ensuring to cover the entire surface.
Roll it up: Starting from one end, gently roll the dough up tightly to enclose the filling. Pinch the seam to seal it.
Slice: Using a sharp knife, cut the roll into even slices, each about 1 inch thick. Place the slices upright on the prepared baking pan.
Bake: Put the pan in the preheated oven and bake for 18-22 minutes or until the rollups are a deep golden brown and cooked through.
Cool and garnish: Allow the rollups to cool for about 5 minutes in the pan, then top them with sliced green onions for a fresh crunch.