Preheat oven to 425°F (220°C). Line a baking sheet with parchment paper.

In a large bowl, whisk together flour, baking powder, salt, and optional sugar.

Add cold butter cubes and use a pastry cutter or fingers to work butter into the flour until mixture resembles coarse crumbs.

Stir in milk until dough just comes together—be careful not to overmix.

Turn dough onto a lightly floured surface; gently pat to about 1-inch thick.

Use a 2½-inch biscuit cutter to cut biscuits straight down; place on prepared sheet with sides touching.

Brush the tops lightly with a little milk for a golden finish.

Bake 12–15 minutes, until tops are puffed and golden brown.

Remove from oven and serve warm. Great for breakfast sandwiches or slathered with butter and jam.