Preheat the oven to 180°C (356°F).
In a bowl, mix almond flour, erythritol, and salt.
Add melted butter and vanilla extract, and knead the dough.
Press the dough evenly into a parchment-lined pan.
Bake in the oven at 180°C (356°F) for 20 minutes.
Let it cool, then cut into bite-sized pieces.