Preheat oven to 375 degrees F. Line a baking sheet (1/2 sheet size) with parchment paper and set aside.
In the bowl of a stand mixer, whisk together the flour, baking powder, sugar and salt.
With the paddle attachment on the lowest setting, add the cold butter pieces, one at a time, until it is mixed into the flour. The crumb of the butter and flour mixed together should be about the size of small peas.
Add the blue cheese, bacon and green onions and mix again on low until well combined.
Pour in the buttermilk and mix on low just until the dough comes together. Don't over mix the dough.
Use a large cookie scoop (2 tablespoon capacity) to scoop the dough onto the baking sheet. You will get 12 scones.
Bake the scones for 16 - 18 minutes, or until lightly browned. Rotate the sheet pan halfway through baking time. Allow the scones to cool on the pan for about 10 minutes before serving.