Rustic Potato Bread

This lovely loaf has a crackling-crisp crust and a soft, chewy interior. I love it for dunking, toasting, and for just plain eating. Ingredients are listed below. To get the printable recipe, please visit my website here: https://bit.ly/31FRy0t

Ingredients:
1 pound potatoes (about 3 medium)
3/4 cup (177ml) reserved potato cooking water
2 1/4 teaspoons (7g) active dry yeast
4 cups (480g) all-purpose or bread flour
2 1/2 teaspoons kosher salt
2 tablespoons vegetable oil
Extra flour for dusting; 1 tablespoon cornmeal for sprinkling
Baking temperature and time:
450°F for 30 minutes with lid on
400°F for 15 minutes with lid off