Preheat the oven to 425 degrees F. Prepare a parchment-lined baking sheet and set aside.

In a large mixing bowl, add warm water and yeast. Let sit for 5 minutes, until the yeast is nice and bubbly.

Once yeast has bubbled, add sugar and oil, then stir gently.

Add the beaten egg into the yeast mixture and stir to incorporate.

Add 3 cups of the flour and knead dough for 5 minutes. Add the remaining flour, a little at a time, as needed.

Once dough is kneaded into a soft dough that is no longer sticky, cut it into 8 equal pieces. On a lightly floured surface, roll each piece of dough into a ball.

Place dough balls on the prepared baking sheet. Cover and let rest for 10 minutes. 

After 10 minutes, beat one egg yolk with water, and brush the egg wash over the tops of each dough ball.

Bake for 8-12 minutes or until golden brown.