1. Preheat your oven to 350°F (175°C). Place the butter in a 9×13-inch baking dish and melt it in the oven.
2. In a mixing bowl, combine the flour, sugar, and baking powder. Stir in the milk until the batter is smooth.
3. Carefully pour the batter over the melted butter in the baking dish. Do not stir.
4. Spoon the cherry pie filling evenly over the batter. Again, avoid stirring; the batter will rise around the filling as it bakes.
5. Bake for 40-45 minutes, or until the top is golden brown and bubbly.
6. Let the cobbler cool slightly before serving. Serve warm with a scoop of vanilla ice cream, if desired.