Begin by preheating your oven to 275 degrees F (135 degrees C). As the oven warms, place half a cup of butter into a 9x13-inch baking dish. Insert the dish into the oven to allow the butter to melt gently.

While the butter is melting, take a medium-sized mixing bowl and combine the all-purpose flour, white sugar, and baking powder. Mix these dry ingredients thoroughly before blending in the milk to form a smooth batter.

Once the butter has completely melted, carefully remove the baking dish from the oven. Pour the prepared batter over the melted butter. It's important not to stir the mixture at this point. Next, evenly distribute the cherry pie filling over the batter, taking care to maintain distinct layers.

Adjust the oven's temperature to 350 degrees F (175 degrees C). Place the dish back into the oven and bake for 50 to 60 minutes. You're looking for a beautifully golden crust to form on top, indicating it's perfectly done.