1. Melt butter in a 13x 9 inch baking dish
2. Combine flour, 1 cup sugar, baking powder and salt; add milk, stirring just until dry ingredients are moistened. Pour batter over butter (do not stir).
3. Bring remaining 1 cup sugar, peaches, and lemon juice to a boil over high heat, stirring constantly; pour over batter (do not stir). Sprinkle with cinnamon if desired.
4. Bake at 375 degrees for 40-45 minutes or until golden brown. Serve cobbler warm or cool.