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Combine lemon instant pudding mix, whole milk, and fresh lemon juice in a mixing bowl. Whisk together until pudding is thick (about 2 minutes).
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Spread 1 1/2 cups onto the prepared crust.
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Beat the heavy whipping cream and powdered sugar in the bowl of a stand mixer, or with a handheld blender, until stiff peaks form. This takes about 5 minutes.
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Add half of the freshly whipped cream into the remaining lemon pudding mix and whisk together until combined. Spread over the lemon pudding in the pie crust.
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Top the pie with the remaining whipped cream.
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Cover with the enclosed lid and let refrigerate for at least 3-4 hours before serving. For best results make the night before and let it sit in the fridge overnight.