Preheat oven to 350 degrees.
Put 1 teaspoon (or less) of melted butter into each regular size muffin tin.
With a wooden spoon stir together the sugar, flour, baking powder, salt, and milk. (I also added ⅛ teaspoon of cinnamon and nutmeg).
Put 2 tablespoons of batter into each muffin tin. Add 1 tablespoon diced peaches on top of the batter.
Sprinkle with brown sugar and then cinnamon.
Bake for 12 minutes.
Let them cool almost completely before taking out of the pan. Use a butter knife to loosen the edges then just lift them out.