Load the crockpot: Place the chicken breasts in the crockpot. Sprinkle the ranch seasoning over them, then pour on the buffalo wing sauce.
Cook: Cover and cook on low for 5-6 hours or high for 3 hours, until the chicken reaches 165°F and shreds easily.
Shred: Shred the chicken right in the crockpot with two forks.
Finish the sauce: Add the butter and stir until it melts into the sauce and the chicken is glossy and coated. Let it sit 10 minutes on warm so the meat drinks the sauce back in.
Serve: Pile onto buns, wraps, or rice, topped with green onions.
Notes
For a creamy dip-style version, stir in 4 oz cream cheese with the butter. Milder: use 1/2 cup wing sauce and an extra tablespoon of butter.