Mix the active sourdough starter with warm milk until smooth.
Add sugar, salt, and baking powder, stirring well to combine.
Gradually incorporate the all-purpose flour, mixing until a soft dough forms.
Knead the dough gently on a floured surface for about 5 minutes.
Place the dough in a greased bowl, cover, and let it rise for 1-2 hours.
Punch down the dough and roll it out to about 1-inch thickness.
Cut out muffins and place them on a cornmeal-dusted baking sheet.
Cover and let the muffins rise for another 30 minutes.
Preheat a skillet over medium heat and cook the muffins for 5-7 minutes per side.
Let the muffins cool on a wire rack before serving.