In a medium bowl, combine the flour, baking powder
and salt; set aside. In a large bowl, beat 1/2 cup
butter with an electric mixer on medium to high
speed for 30 seconds. Beat in granulated sugar
until well combined. Add egg and vanilla, beating
until combined. Alternately add the flour mixture
and milk to beaten butter mixture, beating on low
speed after each addition just until combined.
Spread batter evenly over the peaches in the pan.
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