Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper or lightly flour a cast iron skillet.

In a large mixing bowl, whisk together flour, baking soda, and salt.

Make a well in the center and pour in the buttermilk. Using your hands or a wooden spoon, mix until just combined. The dough should be sticky but hold together.

Turn the dough onto a floured surface. Gently shape it into a round — do not knead.

Place the round loaf onto the baking sheet or skillet. Use a sharp knife to cut a deep “X” across the top.

Bake for 35–45 minutes, or until the crust is golden and a skewer inserted into the center comes out clean.

Cool on a wire rack for at least 30 minutes before slicing.