Cream together the butter and yogurt (or kefir). Slowly add the flour and salt until everything is combined into a nice dough.
At this point you can either use it immediately or leave it on the counter for 12-24 hours to soak.
When you are ready to use it, roll out the desired amount on a floured surface and use as desired.
Depending on what you are using the dough for, it usually takes around 30 minutes to bake at 350 degrees. Adjust your baking temperature and time for what you are making.
Notes
If you put this in the refrigerator to roll out later, it will have to return to room temperature before the dough is workable. It is hard as a rock when it first comes out of the fridge.