Preheat your oven to 425 degrees F (220 C).
In a large bowl place the flour and salt.
Add a little milk at a time until a stiff dough is formed.
Add the baking soda to the rest of the milk in the cup – there should be about a tablespoon left.
Pour the milk and baking soda mix into the bowl and mix in well until dough forms.
Knead the dough gently about 4 to 5 times. Press out the dough gently so it about ½ inch thick.
Cut into circles with a cookie cutter.
Place around an inch from each-other on a baking sheet lined with parchment paper. (It makes clean up so much easier and the paper can go into the compost heap.) Alternately brush baking sheet with butter or coat with cooking spray.
Bake for 15 minutes or until the edges start to turn golden.
Remove from oven, and leave in tray to cool.