Preheat the oven to 350°F (180°C) and line an 8x8 inch baking pan with greased baking paper.
In a medium mixing bowl, combine the butter with the Erythritol and beat with an electric mixture until smooth and creamy.
Add the egg and vanilla extract and beat to incorporate.
Add the almond flour, baking soda, and salt and beat again for a couple of minutes until well combined.
Fold in the chocolate chips.
Transfer the batter to the prepared pan and press with your fingers to cover the surface. If your pan is too large, create borders with folded baking paper or foil to make sure the bars are thick and the dough is not too spread out.
Bake in the preheated oven for about 20-25 minutes, until slightly golden.
Allow to cool in the pan before slicing and serving.