Boil water in a kettle in pour into the pot you are going to use. Rinse and peel the potatoes and let them cook in the boiling water for about 8-12 minutes or until just about done.
Drain the potatoes and let them drip all the water while you heat your milk.
Once the milk is heated/boiling lower the heat and return the potato pot to the stove with the milk in and then add the potatoes into the milk and start mashing.
Remove from the heat again and while they are still hot add your un-melted butter in and return to the heat and mix on the heat so that the butter can melt into the potato.
Now remove from the heat and add the yogurt and a pinch of salt to taste. You can turn the heat off now. If you want it a bit creamier you can add the melted butter.
