Place your butter in the freezer for a minimum of 20 minutes.
Preheat your oven to 425°F. Position your rack on the 3rd row from the bottom. Line a baking sheet with parchment paper or spray with olive oil.
In a large bowl, combine your flour, baking powder, sugar, and salt. Mix until well combined.
Using a box grater, grate the frozen butter directly into the flour mixture. Use a fork to mix it in evenly.
Pour in the milk and stir with a fork until a dough forms. Use your hands if needed to fully incorporate the flour.
Turn the dough onto a lightly floured surface. Pat it into a 1 1/2-inch thick rectangle. Fold the dough in half, then pat it back out. Repeat this folding process 6 times.
After folding, press the dough into a 1-inch thick rectangle.
Use a 2 1/2-inch biscuit cutter and press straight down (do not twist) to cut out biscuits.
Gather the scraps, fold, and repeat until all dough is used. Place biscuits on your prepared baking sheet.
Bake for 13–16 minutes, until the tops are lightly golden brown.