Crust: Mix crumbs, sugar, and melted butter. Press firmly into a 9-inch pie pan using a flat glass for an even layer. Chill in the fridge while making the filling.
Whip Cream: In one bowl, whip 1 cup of heavy cream to stiff peaks; set aside.
Mix Filling: In a separate bowl, beat cream cheese until smooth. Add condensed milk, lime juice, and zest; mix until well combined.
Fold: Gently fold the whipped cream into the lime mixture until light and fluffy.
Set: Pour into the crust and refrigerate for at least 3 hours (or overnight) until firm.
Topping: Whip the remaining 1 cup of heavy cream and powdered sugar to medium-stiff peaks.
Finish: Spread or pipe the topping over the pie. Garnish with lime zest and serve cold.