Preheat your oven to 375°F . Add the cubed butter into a 9x13 inch pan and place in the oven to melt while you make the rest of the recipe. This will take 5-10 minutes.
½ cup unsalted butter
Place the sliced peaches in a large mixing bowl and toss them with ¼ cup of granulated sugar, the ground nutmeg, ground cinnamon, and cornstarch
4 cups sliced fresh peaches, ⅓ teaspoon ground cinnamon, ⅛ teaspoon ground nutmeg, 2 teaspoon cornstarch, ¼ cup granulated sugar
In a separate mixing bowl, whisk together the flour, granulated sugar and brown sugar, baking powder, and salt.
¼ cup granulated sugar, ½ cup dark brown sugar, 1 cup all-purpose flour, 2 teaspoon baking powder, ½ teaspoon salt
Stir in the milk until the mixture is smooth, and well combined.
1 cup milk
Pour the batter into a greased 9x13-inch baking dish on top of the melted butter. Spoon the peaches evenly over the batter. Do not stir.
Bake for 45-50 minutes, or until the top is golden brown and the edges are bubbling.
Let cool slightly before serving. Enjoy with a scoop of vanilla ice cream if desired.