Preheat your oven to 375°F. Grease 12 muffin cups generously; a vegetable oil pan spray works well.
In a large mixing bowl, cream together the butter and sugar until they're light and fluffy. Add the eggs, one at a time, beating well after each addition. In a separate bowl, whisk together the flour, baking powder and salt. Add the dry ingredients to the
Fill the muffin cups 3/4 to almost full, using all of the batter. Sprinkle with the cinnamon sugar. Bake the muffins for 25 to 30 minutes, until they're light golden brown, remove them from the oven, and place the pan on a rack to cool for 10 minutes. Aft