Preheat the oven to 425°F (220°C).

Line a baking sheet with parchment paper or lightly grease it.

In a large mixing bowl, combine the flour, baking soda, salt, and sugar if using.

Create a well in the center of the dry mixture and pour in the buttermilk.

Using a wooden spoon or spatula, mix until a shaggy dough forms.

Turn the dough onto a floured surface and gently knead for about 1-2 minutes.

Form the dough into a round shape and place it on the prepared baking sheet.

Score a deep cross on top with a knife to allow it to expand while baking.

Bake in the preheated oven for 25-30 minutes until golden brown and hollow when tapped on the bottom.