Heat oven to 375°.

Pour melted butter into a 2-quart baking dish (11x7 or 8-inch square). In a mixing bowl, combine 1 cup of the sugar, the flour, baking powder, and salt; stir to blend. Stir in the milk and vanilla until blended. Pour the batter over the melted butter. Toss the peaches with the remaining 3 tablespoons of sugar and 1/2 teaspoon of cinnamon. Arrange the peach slices over the batter. Bake for 25 to 30 minutes, or until a toothpick inserted into the cake comes out clean. The top will be browned and the cake will begin to pull away from the sides of the pan. Serve warm with a little heavy cream, whipped topping, or a scoop of vanilla ice cream.

Serves 6.