Preheat your oven to 425°F (220°C).

In a large mixing bowl, whisk together the flour, baking powder, salt, sugar, and ground cinnamon until thoroughly mixed.

Cut the cold unsalted butter into small pieces and work it into the dry ingredients until it resembles coarse crumbs.

Pour in the milk and gently stir until just combined, forming a soft dough.

Roll out the dough to about ½ inch thick, and cut into desired shapes. Arrange on a baking sheet lined with parchment paper.

Bake for 10-12 minutes, or until golden brown.

Combine sugar and ground cinnamon, then toss the warm biscuits in the mixture to coat them lightly.

Serve the biscuits warm, perhaps with honey or a pat of butter.