Preheat oven to 350°F (175°C). Line an 8x8-inch baking dish with parchment paper.
In a bowl, mix almond flour, sweetener, melted butter, and salt until crumbly.
Press mixture firmly into baking dish to form an even crust. Bake 10–12 minutes, until lightly golden.
In another bowl, beat cream cheese and sweetener until smooth. Add eggs one at a time, mixing well.
Stir in lime juice, zest, heavy cream, and vanilla until fully combined.
Pour filling over the baked crust and smooth the top.
Bake 20–25 minutes, until filling is set but still slightly jiggly in the center.
Cool completely, then refrigerate at least 2 hours before cutting into bars.
Garnish with lime zest or whipped cream before serving.