In the bowl of your electric mixer (fitted with the beater attachment), combine whole wheat flour, yeast, pumpkin pie spice and baking soda. Add in milk, pumpkin, honey, olive oil and water, beating on low speed until combined, about 30 seconds. Increase the speed to medium-high and beat for 3 minutes, scraping down the sides if necessary. Decrease speed to low and add in remaining flour and salt, mixing until just combined – do not overmix, do not knead. The dough will be sticky. Divide batter equally into two loaf pans and sprinkle the tops with cornmeal. Cover and let rise in a warm place until doubled in size, about 45-60 minutes.