01 - Preheat oven to 425°F. Line a baking sheet with parchment paper.
02 - Combine shredded chicken, hot buffalo sauce, and melted butter in a small bowl until evenly coated. Allow to cool slightly.
03 - In a large bowl, whisk together flour, baking powder, baking soda, salt, and garlic powder.
04 - Add cubed cold butter to the dry mixture and cut in using a pastry blender or fork until coarse crumbs form.
05 - Fold blue cheese crumbles into the flour and butter mixture.
06 - Add buffalo chicken mixture and buttermilk to the bowl. Mix gently until just combined, taking care not to overwork the dough.
07 - Turn out dough onto a lightly floured surface and pat into a 1-inch-thick rectangle.
08 - Cut rounds using a 2.5-inch biscuit cutter and place 2 inches apart on the prepared baking sheet.
09 - Brush biscuit tops with extra buttermilk. Bake for 18–20 minutes until golden brown and cooked through.
10 - Cool biscuits for 5 minutes, then garnish with chopped scallions and additional blue cheese if desired. Serve warm.