- Melt "crust" butter in the microwave or a small saucepan. Add the almond flour, sweetener, and vanilla to the melted butter. Stir until fully mixed. Press the dough evenly along the bottom of a parchment lined 8 x 8 inch square pan. Bake for 15 minutes or until lightly golden. Remove and cool while you make the filling
- Melt "filling" butter in a small saucepan on low heat. Remove from heat and whisk in sweetener, lemon juice, and lemon zest until dissolved. Whisk in the egg yolks one at a time and return to the stove over medium heat for 1-2 minutes stirring continuously. Whisk in the xanthan gum until smooth.
- Pour the filling over the pre-baked crust and spread out evenly in the pan. Bake the bars at 350°F for 15-20 minutes. Remove and cool.
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