Preheat the oven to 350°F (175°C). Grease an 8x8 inch baking dish.

Cut the avocados in half, remove the pits, and scoop out the flesh into a bowl.

Use a fork to mash the avocados until smooth.

Add the cocoa powder, almond flour, erythritol, eggs, vanilla extract, baking powder, and salt to the bowl with the mashed avocados. Mix well until the batter is smooth and combined.

Pour the batter into the prepared baking dish and smooth the top with a spatula.

Bake in the preheated oven for 25 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.

Remove from the oven and let cool in the baking dish for 10 minutes, then transfer to a wire rack to cool completely.

Cut into 12 squares and serve.