In a large mixing bowl stir together flour, salt, and baking powder until combined.
Add discard, milk and 1 tablespoon of olive oil to the dry ingredients in the bowl.
Stir until you have a shaggy, lumpy dough.
Turn the dough out onto a floured work surface.
Flour your hands and knead the dough for 5- 8 minutes or until it comes together into a soft, smooth dough ball that's no longer sticky to the touch.
Form the dough into a ball and wrap it in plastic wrap.
Let the dough rest on the counter for 30 minutes.
Unwrap the dough and cut it into 6, equal sized pieces.
Heat a cast iron skillet over medium high heat on the stove.
While skillet is preheating on the stove roll out a piece of dough into a 8 to 10 inch circle, about an ⅛ inch thick.
Baste the top with olive oil and place dough, olive oil side down in the hot skillet on the stove.
Baste the top of the dough with olive oil as it cooks on the first side.
When the dough bubbles up and the bottom is lightly charred, flip flatbread over with a spatula and cook on the second side until charred and cooked through, about 1 minute.
Transfer to a platter and cover with a dish towel to keep warm while you roll out and cook up the remaining pieces of dough.