Combine the sourdough starter, warm milk, and yogurt in a large bowl, stir until smooth and consistent
Add in the flour and baking powder, as it mixes it will become a slightly sticky and shaggy dough
Cover the bowl with a clean, damp dishtowel and let it rise in a warm place for 2-3 hours. The oven with the light on is perfect
On a clean lightly floured surface, dump out the bowl scraping the sides if it sticks. Knead the dough for a few minutes until smooth, you may need to add a little more flour as you work to ensure your hands don't stick.
Preheat a heavy skillet or cast iron pan on medium-high heat. Turn the exhaust fan on before you start, I always end up with a smoky kitchen.
Shape the dough into a flat ball or log and divide into 8 equal pieces. Roll flat to about ¼" thickness
Brush melted butter on one side and place butter side down into the hot skillet. Brush the top side with butter while the bottom starts to cook.
Cook each side for about a minute watching for bubbles to form on the top. Check the underside to ensure it is golden brown to your liking and flip.
Cook for another minute, check the bottom for brown.
Once done transfer to a plate lined with a towel and wrap if you are going to be serving right away. Or transfer to a cooling rack if you are prepping them a head of time so they can cool without holding too much moisture.
Continue cooking process with the remaining pieces and enjoy!