I've made this recipe twice. The first time, as written, the muffins were small, rather hard on the outside but not done on the inside. The next time, I made 3 changes and came out with a great batch of muffins! First, I decreased the Splenda to just one full cup to make a less-sweet muffin; then I added an extra 1/2 cup of boiling water to make a smoother batter; finally I baked the muffins at 350* for 16 minutes. Be sure to not overmix the batter and allow the muffins to cool in the tins before removing to a rack. Reviewed for PAC Fall '11.