Preheat your oven to 350°F (175°C).

Line an 8×8-inch baking dish with parchment paper or lightly grease it. In a large bowl, cream together the softened butter and erythritol until light and fluffy.

Add the egg and vanilla, mixing well. In another bowl, whisk together almond flour, baking soda, and salt.

Gradually add the dry ingredients to the wet mixture, mixing until combined.

Fold in the chocolate chips.

Pour the dough into the prepared dish and spread evenly.

Bake for 18-20 minutes, or until golden brown. Let cool completely before cutting into squares.