Preheat the oven to 350 degrees and line a small baking pan with parchment paper.
Scoop the avocado flesh into a mixing bowl and mash it until smooth with a fork.
Add the cocoa powder, maple syrup, eggs, almond flour, vanilla extract, baking soda, and salt to the bowl.
Stir everything until a thick batter forms and no large lumps remain.
Spread the batter evenly in the prepared pan.
Bake for 18 to 20 minutes until the center feels firm to the touch.
Let the brownies cool completely in the pan.
Melt the dark chocolate in a small bowl in the microwave using short bursts.
Drizzle or pipe the melted chocolate over the brownies to form hair and neck bolts.
Press candy eyes onto each brownie to finish the faces.