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Beat butter at medium speed until creamy. Gradually add sugars, beating well until light and fluffy. Add egg, vanilla, and lemon juice and beat until well combined. Add flour, baking powder, and cinnamon to butter mixture and beat at medium speed until just combined. Fold in pistachios with a spatula.
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Shape dough into 2 - 6 inch logs. Wrap with plastic wrap and freeze until firm, about 30 mins – 1 hour.
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Slice frozen dough into 1/8 inch thick rounds. Place rounds on a parchment paper lined cookie sheet.
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Bake at 350* for 10-12 minutes or until lightly browned at edges. Cool one minute on pan, then transfer to cooling rack to cool completely.
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Assemble sandwiches with cannoli filling.