In a medium bowl, whisk together the flour, sugar, salt, and baking powder until fully incorporated.
In another medium bowl, whisk together the egg, yogurt, milk, and water.
Add the dry ingredients to the wet ingredients.
Using your hands or a bowl scraper, mix for 2 to 3 minutes, until the dough comes together.
Transfer the dough to a lightly floured work surface. Using your hands, knead for 4 to 5 minutes, until the dough is almost smooth.
Loosely cover with plastic wrap and a clean kitchen towel and let rest on the work surface for 15 to 20 minutes.
Knead the dough for another 2 to 3 minutes, until smooth. (Alternatively, you can knead the dough in a stand mixer on medium speed for 5 to 7 minutes, until smooth and no longer sticking to the sides of the bowl.)
Cover with plastic wrap or a kitchen towel and let rest for 5 to 10 minutes.