Combine the fed sourdough starter and warm water in a mixing bowl.

Gradually add the all-purpose flour, granulated sugar, unsalted butter, large egg, and salt, mixing until a dough forms.

Knead the dough on a floured surface until smooth.

Let the dough rise in a warm place until doubled in size.

Roll out the dough to about 1-inch thickness and cut into rounds.

Dust the rounds with cornmeal and place on a baking sheet.

Allow the rounds to rise for an additional period.

Cook on a griddle or in a skillet until golden brown on both sides.