In a large bowl, combine 1 cup flour, oat bran, yeast and salt. In a small saucepan, heat water and honey to 120°-130°. Add to dry ingredients; beat just until moistened. Stir in enough remaining flour to form a stiff dough (dough will be sticky).
Turn onto a lightly floured surface; knead until smooth and elastic, about 6-8 minutes. Place in a bowl coated with cooking spray, turning once to coat the top. Cover and let rise in a warm place until doubled, about 30 minutes.
Punch down dough. Turn onto a lightly floured surface. Shape into a round loaf. Place on a baking sheet coated with cooking spray and sprinkled with cornmeal. Cover and let rise until nearly doubled, about 30 minutes. With a sharp knife, make three diagonal slashes across top of loaf.
Bake at 400° for 20-25 minutes or until golden brown. Remove from baking sheet to wire rack to cool.