Preheat oven to 475°F. Line a baking sheet with parchment paper; set aside. Place flour in a large mixing bowl. Using the larger holes on a box grater, grate the stick of butter into the flour.
Use your fingers to coat all of the butter with flour, and then work the butter into the flour with your finger tips for about 2 minutes. Chill in the freezer for 10 minutes.
Make a well in the center of the flour mixture. Add the buttermilk, and stir with a wooden spoon (or with your hands) just until a shaggy dough comes together.
Turn the dough onto a well-floured work surface. Fold the dough over onto itself 6-8 times, just until it comes together. Pat the dough into a rectangle that’s about ¾ inch thick. Use a 2 ½ -inch round biscuit cutter to punch out the biscuits (do not twist the cutter). Arrange the biscuits on the parchment-lined baking sheet with sides touching. Re-roll the scraps and cut out additional biscuits until all of the dough is used. If time allows, place the biscuits back in the freezer for 10-15 minutes to chill again before baking.
Bake for 11-15 minutes, or until golden brown. Brush the hot biscuits with the melted butter. Serve warm.
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Notes
In a pinch, you can make your own buttermilk at home to use in this recipe. To do so, pour either 1 tablespoon of freshly squeezed lemon juice or 1 tablespoon of white vinegar into a large measuring cup. Add enough milk to equal 1 cup of liquid. Give it a stir, let it sit for about 5 minutes, and then use it in the recipe as directed!
If you don't have a bag of self-rising flour in your pantry, that's no problem. You can make 1 cup of self-rising flour by placing 1 cup of all-purpose flour in a bowl. Whisk in 1 teaspoon of baking powder and ¼ teaspoon of salt. This recipe calls for 2 ½ cups of self-rising flour, so you would need to combine 2 ½ cups of all-purpose flour with 2 ½ teaspoons of baking powder and ½ teaspoon plus 1/8 teaspoon of salt.