Preheat oven to 375.
Split peaches in half and remove stones.
Place peach halves in 9x13" dish.
Fill each with 1 teaspoon of brown sugar.
Cut butter into 1/2 tablespoon pats and place on top of each peach half.
In a small dish combine cinnamon and sugar and mix well.
Sprinkle each with cinnamon sugar mixture.
Bake for 30 minutes.