Mix the wet ingredients for the muffin mixture in a medium-large bowl; combine all dry ingredients in a separate bowl and then add to wet mixture. Mix everything together until the mixture is wet. DO NOT STIR TOO MUCH. Batter will be lumpy. Pour batter into 12 regular-sized muffin tins (use a nonstick pan or paper muffin cups). Bake at 350 degrees F for 20-25 minutes. For the topping, mix the cinnamon and sugar in a small bowl, and then melt the butter in another small bowl. Take the muffins out of the pan (while they're still warm) and dip the top in the melted butter. Then, quickly dip the top in the sugar mixture to coat the top. Once you've done all 12 muffins, you can do them all again to get an extra-sugary top. Taste best still warm, but are good either way :)