Grease 2 bread pans (8.5 x 4.5 in) and sprinkle with cornmeal.
Combine 3 cups flour, yeast, sugar, salt and baking soda in bowl of stand mixer fitted with paddle attachment.
Heat milk and water together to about 120-130°F. Add to dry ingredients and beat well. Stir in the remaining flour to make a stiff batter. Spoon into the prepared pans and sprinkle tops with cornmeal. Cover and let rise about 45 minutes (30 minutes if using quick rise yeast), or until risen dough crests the top of the pan by about ½ inch.
Preheat oven to 400°F and bake for about 25 minutes. Remove from pans immediately and let cool on a wire rack.