In the bowl of a stand mixer, combine brown sugar & yeast in water. Stir to dissolve. Let stand until foamy, 5 to 10 minutes. Add eggs, cooled cornmeal mixture & 1/2- 3/4 cup flour. Beat at medium speed for about 2 minutes. Stir in enough remaining flour to make a soft dough. As soon as the dough pulls away from the pan, stop adding flour.