Place a baking sheet on the bottom rack of your oven and a pizza stone or cookie sheet on the middle rack. Preheat the oven to 450°F.
About 10 minutes before baking, carefully pour water into the baking sheet on the bottom rack to create steam. Fill it about halfway, then close the oven door.
Turn each loaf onto parchment paper and score the tops with a sharp knife or bread lame. Brush the tops lightly with egg wash.
Carefully place the loaves, along with the parchment paper, onto the hot pizza stone or cookie sheet.
Bake for 30 to 40 minutes, or until the bread bowls are golden brown and the internal temperature reaches about 200°F.