Boil the potatoes for about 12 minutes. They need to be semi-soft and easy to cut into thin slices. Boiling them too long will make them too soft. So keep it to 12 minutes max.
Once the potatoes have cooled down, cut them into thin slices.
Preheat the oven to 475F. Lightly brush the cast iron skillet with a little olive oil.
Make the 2 ingredient dough with the flour and yogurt. If you find it too sticky, add a little extra flour, and make sure you use flour on the surface and the rolling pin.
Roll out the dough so it is big enough to fit into the skillet. You don't want the dough too thick. If it is not a perfect circle, it's ok.
When you place the dough in the skillet make sure it comes up the edges to form a crust then lightly brush a little more olive oil on top of the dough.
Spread the ranch dressing onto the bottom of the dough, then lay on the potato slices, making sure you cover all areas.
Sprinkle the cheese on top of the potato slices and add crumbled, cooked bacon and diced onion.
Bake the pizza in the oven for 16-18 minutes or until the crust looks golden brown. Let it cool a bit before slicing. Enjoy!