Preheat oven to 350 F.

In a medium bowl, mix together the chicken, buffalo sauce, ranch dressing and green onion until well-combined. 

Slice the rolls in half; set tops aside. Spoon chicken filling on to bun bottoms and spread out over the edges. Fold provolone slices in half and lay evenly over the chicken, overlapping each slightly. 

Replace bun tops. Stir the ranch dressing mix into the butter and baste over sliders. 

Bake in preheated oven for 10-15 minutes, until cheese is melted and tops are golden brown. Serve immediately.