Place 6 tablespoons unsalted butter (85 g) in the freezer for 10–15 minutes before starting. Preheat your oven to 425°F and line a baking sheet with parchment paper.
In a large mixing bowl, whisk together 2 cups all-purpose flour (250 g), 1 tablespoon baking powder, and 1 teaspoon salt.
Grate the chilled butter directly into the flour mixture using a box grater. Gently toss until the butter is coated and the mixture looks crumbly.
Pour in ¾ cup whole milk (177 ml) (or buttermilk if you have it) and stir gently with a wooden spoon until just combined. The dough should look slightly shaggy.
Transfer the dough to a well-floured surface. Using your hands, gently fold it in half, press lightly, rotate, and repeat 5–6 times. This folding creates the flaky biscuit layers.
Pat the dough to about 1 inch thick. Dust a 2 ¾-inch biscuit cutter with flour and cut straight down into the dough (don’t twist). Place biscuits less than ½ inch apart on the prepared baking sheet.
Gather the scraps, gently press them together, and cut additional biscuits until you have at least 6.
Bake at 425°F for 12 minutes, or until the tops are just beginning to turn golden brown.
Brush with melted butter if desired, and serve warm.