In a medium mixing bowl, combine the keto cookie crumbs, allulose, and melted butter. Mix until well-coated and press into the pie pan to form a crust. Refrigerate to set.
In a large mixing bowl, beat the softened cream cheese until smooth. Gradually add in the keto condensed milk and lime juice, mixing until creamy.
In a separate bowl, whip the heavy cream until soft peaks form. Gradually add the sugar-free powdered sugar and continue whipping until stiff peaks form.
Gently fold the whipped cream into the cream cheese mixture using a rubber spatula.
Pour the filling into the chilled crust, smoothing the top. Cover with plastic wrap and refrigerate for at least 4 hours or overnight.
Once set, slice the pie and garnish with lime slices. Serve chilled and enjoy!