Preheat oven to 350 degrees.
Pour melted butter into a 9x13 baking dish.
Mix flour, 1 cup of the sugar, baking powder and salt in a medium bowl. Add milk and stir till just combined. Pour this batter over the butter in the baking dish but don't stir together.
Combine peaches, the remaining cup of sugar, and the lemon juice in a saucepan and bring to a boil over high heat, stirring constantly. Pour peaches over batter in dish, but don't stir together.
Shake cinnamon and/or nutmeg over the top if desired. Bake 40-45 minutes or till the top is golden-brown.
This smells like heaven while it's baking and after you take it out of the oven! I recommend using cinnamon and freshly grated nutmeg on the top--it really adds a lot!