INGREDIENTS
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1 c butter, softened
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2 c granulated sugar
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3/4 c buttermilk
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1/3 c key lime juice
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5 large eggs
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3 c all-purpose flour
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1 1/2 t salt
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1/2 t baking powder
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1/2 t baking soda
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green food coloring (optional)
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Key Lime Buttercream Frosting
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1/2 c butter, softened
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1 1/2 t key lime zest
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1 t vanilla extract
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1/8 t salt
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2 c powdered sugar
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3 T key lime juice
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1-2 T milk