Preheat oven to 325F.
In a medium bowl, add one egg and whisk a little. Then add the maple syrup, almond butter, coconut oil, and almond milk. Combine thoroughly.
Then add the almond flour, baking soda, salt, and cacao powder and incorporate the dry ingredients into the wet using a rubber spatula.
Add the chunks of chocolate and chopped hazelnuts into the brownie batter.
Grease or line a 8' x 8' pan and evenly spread the brownie batter. Pop in the oven for 16 minutes.
While the brownies are baking, combine hazelnuts, coconut sugar, and cacao powder in a food processor and process until it turns into a smooth and creamy texture like nut butter.
Once the brownies are done, allow to cool for 10 minutes. Then spread the hazelnut butter along the top. Sprinkle with chopped hazelnuts and slice!