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Preheat oven to 325 degrees F
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Spray an 8" or 9" springform pan with baking spray
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Combine the flour, salt and baking powder in small bowl and set aside
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Cream together the butter, sugar and lemon zest in large bowl
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Add the egg and mix to combine
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Mix in the vanilla and lemon juice
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Add half of the flour mixture and mix
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Add in the milk
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Mix in the remaining flour just until combined
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Pour the batter into the prepared pan and spread evenly
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Top with the refrigerated topping
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Bake 50 - 60 minutes, until top begins to brown and toothpick inserted in center comes out clean
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Cool in pan 30 minutes
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Remove to serving platter and dust with powdered sugar
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Enjoy!