In a large bowl, mix together the flour, salt, sourdough starter, and milk until combined. It’ll be shaggy, so you’ll need to bring it together with your hands into a dough ball.
Turn the dough out onto the counter; no flour is needed at first. Knead the dough for 2 minutes. Add a little flour if the dough does get sticky.
Then place it back in the mixing bowl and cover loosely with a towel, lid, or plastic wrap.
Let the dough ferment in a warm place for 6–8 hours until it has doubled. The best spot is to turn your oven on the lowest setting for 30 seconds, then turn it off and stick your dough inside. (Don't leave the oven on.)
Optional: Once the bulk fermentation is finished, place the dough in the fridge for up to 24 hours if you want more gut benefits or need more time before baking.
After the dough has doubled in size, turn it out on the counter (you shouldn’t need flour) and cut the dough into 6 pieces.
Roll each one out into a circle-like shape (it won’t be perfect) until it’s 1/4” thick. Repeat until all are done. If the dough is sticking, you can use a little flour.
Heat a stainless steel or cast iron pan over medium heat and add in 1 teaspoon of avocado oil to coat so it doesn’t stick.
Once heated and the air above the pan feels warm, place 1 flatbread in at a time and cook for 2-3 minutes. Then flip and cook another 2-3 minutes until the dough is puffy and has golden brown spots.
When finished cooking all the naan, mix melted butter, garlic powder, and parsley flakes in a small bowl.
Brush the tops of the cooked naan bread with this melted butter mixture, then enjoy!