Stir chicken, hot sauce, melted butter, cream cheese, ranch, garlic powder, and green onions until creamy.
Warm a large skillet or griddle over medium-low heat.
Spread the softened butter on one side of each bread slice.
Layer cheddar on the unbuttered side of half the slices. Spoon on the Buffalo chicken, then add Monterey Jack and a pinch of blue cheese if using.
Top with remaining bread, buttered side facing out. Cook until golden, 3–4 minutes per side, lowering heat if browning too fast.
Rest 1 minute, then slice and serve with extra hot sauce or ranch for dipping.
Notes
Swap cheeses to taste: pepper jack for heat, or all mozzarella for extra melt. Add a crunch by tucking in thin celery slices after grilling. For a calmer sandwich, use half the hot sauce and a touch more ranch. Leftovers reheat best in a skillet or air fryer to re-crisp; refrigerate up to 2 days.This recipe is an original creation inspired by classic Buffalo Chicken Grilled Cheese Recipes flavors. All ingredient ratios and instructions are independently developed.