Preheat oven to 350°F. In a medium-large bowl, sift together all dry ingredients for the muffins. Add wet ingredients and stir until combined, but still a bit lumpy. Be careful not to over mix. Spray muffin tins with cooking spray and scoop batter using a large ice cream scoop. Bake for 20 to 25 minutes, or until they just start to turn a bit golden at the edges. TOPPING:Mix sugar and cinnamon in a small bowl. Dip the warm muffins in melted butter (you can dip just the top, but it’s even tastier to dip the whole muffin!), then dip/roll the muffin in cinnamon sugar.