Preheat oven to 450 degrees F. Grease a baking sheet with cooking spray.
Whisk together flour, baking powder, sugar, garlic powder and salt in a large bowl. Add butter to mixture and use a pastry cutter or two knives to blend until the mixture resembles a coarse meal. Stir in cheese and parsley. Add buttermilk and stir until just combined.
Use a large ice cream scoop to drop biscuits onto the prepared baking sheet. Sprinkle with flakey sea salt. Bake until golden brown, 15 to 18 minutes. Serve immediately.