Begin by preheating your oven to 400°F.
In a large mixing bowl, whisk together the flour, baking powder, sugar, and salt.
Shred (or cut) the cold butter directly into the dry mix. Once shredded, use a fork to gently distribute the butter throughout.
Pour in about 2/3 of the buttermilk and stir gently with a spoon or spatula until just combined. The dough should be slightly sticky but manageable. If it's dry and crumbly, add the rest of the buttermilk.
Lightly flour a clean surface and turn the dough out onto it. Gently pat (or roll if preferred) it into a 1-inch-thick rectangle.
Using a biscuit cutter or the rim of a glass, cut out biscuits and place them in a cast iron skillet or on a baking sheet. For soft-sided biscuits, arrange them close together; for crispier edges, space them apart.
Bake in the preheated oven for 15-18 minutes, or until the tops are golden brown.