Preheat the oven to 350°F or 175°C and lightly grease a 9-inch pie dish.
Mix the almond flour, 1/4 cup sweetener, melted butter, and salt. Press the mixture across the bottom and sides of the dish.
Bake the crust for 10 minutes, then remove it from the oven and let it cool slightly.
Beat the cream cheese until smooth, then mix in the yolks, cream, sweetener, lime juice, zest, and vanilla.
Pour the filling into the crust and bake for 14 to 16 minutes, until the edges are set and the center still moves slightly.
Cool completely, then refrigerate for at least 3 hours before slicing.
