In a large mixing bowl whisk together the milk, sourdough starter, eggs, and sugar until they are fully combined.
Sift in the flour and salt, and mix until no lumps of flour remain.
After mixing the dough together, cover your bowl and allow it to rest for 30 minutes.
Once the dough is rested perform slap and folds, or mix in a stand mixer, until it is smooth and holds its shape, about 10-15 minutes.
To shape each portion of dough, fold the edges into the center. Flip it over so that it is seam side down and roll it gently with your hands until it is smooth and round.