In a large bowl, add 2 ¼ cups of self-rising flour. Keep the flour chilled if possible to help the biscuits rise higher.
Take one stick of frozen butter and shred it with a grater. Toss the butter into the flour and mix lightly with your hands so the shreds are coated and spread out evenly.
Pour in 1 cup of cold buttermilk. Stir gently with a spoon until the flour is just moistened. The dough will look shaggy and sticky, but that’s normal.
Turn the dough out onto a lightly floured surface. Gently bring it together with your hands without kneading too much. Pat it into a 1–1.5 inch thick round.
Use a biscuit cutter to press straight down—do not twist, as twisting seals the edges and keeps them from rising. Place the biscuits close together on a buttered skillet or baking sheet.
Preheat the oven to 415°F. Place the skillet inside while heating. Add a few tablespoons of butter to melt before arranging the biscuits. Bake for about 15–18 minutes until golden on top.
Take the skillet out of the oven. Let the biscuits cool for a few minutes before you eat them.