Put the almond flour in a dry skillet over medium heat and toast until golden brown, about 4 minutes, stirring and turning to ensure it toasts evenly.
Remove the flour from the heat, pour into a large bowl, and allow to cool for 5 minutes.
Add the sweetener and sea salt. Stir.
Add the melted butter and vanilla extract. Mix until the flour is completely coated in butter.
Pour the almond mixture into an 8” spring-form pan or loose-bottomed pan lined with parchment paper, and spread out evenly. Using a straight-sided glass or jar, press the almonds down firmly and evenly across the bottom of the pan.
Place the pan in the fridge until the crust is firm, about 30 minutes or overnight.