Preheat the oven to 350 degrees F (175 degrees C).
Melt butter in 9 x 13 inch pan.
Mix together the flour, sugar, and milk. Pour mixture into the pan. Spread peaches, including syrup, evenly around the pan.
Bake in preheated oven for 30 to 40 minutes, until the crust turns golden brown. Let cool for about 10 minutes before serving.
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