Prep the base: Add cream cheese, buffalo sauce, ranch, garlic powder, onion powder, and butter (if using) to the crock pot. Cover and cook on low for 30–45 minutes until softened.
Stir until smooth: Whisk or stir the mixture until creamy and well combined.
Add chicken and cheese: Stir in shredded chicken and cheddar.
If you like, fold in half the blue cheese.
Cook low and slow: Cover and cook on low for 1–2 hours, stirring once or twice, until hot and melty.
Finish and garnish: Taste and adjust heat with more buffalo sauce if needed. Top with remaining blue cheese and sliced green onions.
Serve warm: Switch to the “warm” setting. Stir occasionally to keep it smooth.
Set out with your favorite dippers.