Grate frozen butter using food processor or box grater

Stir butter bits into flour and chill in fridge

Preheat oven to 450 and line a baking sheet with parchment paper

Make hole in center of flour mixture and add buttermilk

Stir until just combined, about 15 stirs.

Roll dough into long rectangle on floured surface

Fold short ends together and roll out into another long rectangle. Repeat 3 more times.

Roll dough out one to 1/2 inch thick. Cut into 10 biscuits, reshaping scraps as needed.

Bake 12 minutes. Brush tops with melted butter.