1-Preheat oven to 350°F (175°C): Preheat oven to 350°F (175°C).
2-Open the sliced-peach cans and drain the: Open the sliced-peach cans and drain the peaches, but reserve the syrup from one can.
3-In a medium bowl, whisk flour, 1/2: In a medium bowl, whisk flour, 1/2 cup sugar, baking powder, and salt. Then stir in the milk until smooth.
4-Pour melted butter into a 9×13-inch baking: Pour melted butter into a 9×13-inch baking dish. Then pour the batter over the butter – do not stir.
5-Spoon the drained peaches evenly over the: Spoon the drained peaches evenly over the batter layer.
6-Mix the reserved syrup with the remaining: Mix the reserved syrup with the remaining 1/2-cup sugar and drizzle it over the peaches. Sprinkle cinnamon or nutmeg, if using.
7-Bake for about 40-45 minutes until the: Bake for about 40-45 minutes until the top is golden and the edges are bubbling. Let it cool a few minutes, then serve warm (great with vanilla ice-cream!).