Preheat oven to 375 degrees F (190 degrees C). Grease an 11×17-inch baking dish.
Whisk milk, flour, and 1 cup sugar together in a bowl until blended; add butter. Stir to combine.
Arrange peaches in prepared baking dish; sprinkle with 1 tablespoon sugar. Cover peaches with batter, without stirring.
Bake in the preheated oven until browned and bubbling, about 40 minutes.
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