Preheat oven to 350°F and line an 8x8 inch pan with parchment paper.
In a medium bowl, whisk almond flour, cocoa powder, baking soda, and salt until combined.
In another bowl, stir melted butter with erythritol until smooth. Beat in eggs and vanilla.
Fold dry mixture into wet ingredients until batter forms.
Stir in chocolate chips.
Spread batter evenly in the prepared pan.
Bake for 20 to 25 minutes or until the edges look set but the center is still soft.
Cool completely before slicing.