Add the 1 1/2 cups graham cracker crumbs to a food processor and grind until coarse. Add the 1 tablespoon light brown sugar, 2 tablespoons sugar and melted and cooled 6 tablespoons salted butter, pulsing until it is a sand-like consistency.
Transfer the crumbs to a 9-inch pie pan, chill in the refrigerator for 30 minutes. OR you can bake the pie crust at 325°F for 8-10 minutes or until light brown. Either will set the crust.
In the bowl of a stand mixer fitted with the paddle attachment or a large bowl using an electric hand mixer, beat the softened 6 ounces cream cheese for 1 minute (or until smooth, then add the 1.14 ounces sweetened condensed milk, 4 ounces frozen lemonade concentrate thawed and zest of 1 lemon. Mix until smooth.
By hand, fold in the 8 ounces whipped topping until combined.
Evenly spread the lemonade pie filling over the crust and place in the freezer to chill for at least 6 hours to overnight.
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Notes
Storage: Store frozen lemonade pie covered tightly in the freezer for up to 2 weeks. Cover the pie with plastic wrap or place it in an airtight container to prevent freezer burn.For the best texture, allow slices to sit at room temperature for 3-5 minutes before serving.Freezing: This pie is meant to be stored in the freezer. Avoid repeated thawing and refreezing as it may affect texture.