Preheat oven to 475℉.
In a medium bowl, whisk together the flour, garlic powder and Old Bay seasoning,
Grate frozen butter with a box grater. Toss it gently into flour mixture.
Toss the sharp cheddar cheese into the flour mixture to evenly distribute.
Chill in the freezer for at least 10 minutes.
Make a well in the center of the mixture. Add buttermilk and stir just until all buttermilk is incorporated with no remnants of flour remaining. The dough will be sticky. Do not overmix.