In a large mixing bowl, using an electric mixer with a whisk attachment or a handheld mixer, beat the unsalted butter and cream cheese together on medium-high speed until the mixture is very smooth (about 2 minutes).
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1
Add the pure maple syrup, vanilla extract, fine sea salt, and your choice of lemon or orange juice. Continue to beat on medium-high speed until the frosting becomes light and fluffy, which will be about 4 minutes.
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3
If the frosting seems too soft for spreading, place it in the refrigerator to chill for about 10 minutes.
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