In a liquid measuring cup, combine the warm water, yeast and 1 tsp sugar. Let proof for 5-10 minutes.
In the bowl of a stand-mixer fitted with a hook attachment, add the flour, 1/4 cup sugar, egg, milk, salt, baking soda, yeast mixture, and sourdough discard.Mix on low speed until the flour has been absorbed, then turn the mixer up to medium-low speed and mix for 6-8 minutes, until the dough is stretchy and has come into a ball.
Oil and a large mixing bowl with avocado oil and place the dough ball in it, turning the dough to coat it in oil. Cover with plastic wrap and allow to rise in a warm place until it has doubled in size, about 1 hour.
After the first rise, lightly flour a work surface and turn the dough out of the bowl. Cut the dough into 8 or more pieces, depending on the desired size flatbread, and shape into a ball.
Line a baking with parchment paper and lightly spray it with avocado oil spray.Place the dough balls onto the baking sheet and loosely cover with plastic wrap. Let rise again in a warm place for 20-30 minutes.
Preheat a cast iron skillet or griddle over medium heat. Roll each dough ball out until it is thin, but not tearing, roughly 6-8".Spray the skillet with avocado oil spray and then place the flat bread dough into the pan. Fry the flatbread for 2-3 minute per side, then remove to a dish towel-lined plate and serve warm. Enjoy!!