Preheat oven to 350F and prepare an 8x8" baking tin with parchment paper.
Mix the milk, sugar, flaxseed, vanilla and almond butter together until well combined. This may take a while if the almond butter is not easy to stir, so warm prior to adding if needed.
Add all dry ingredients except the chocolate chips to the mixture and mix.
Fold in the chocolate chips until well combined.
Pour into prepared pan and bake for 25-30 minutes, or until a toothpick inserted into the brownie comes out dry.
For the frosting
Heat the almond milk and coconut oil, either in a small saucepan or in the microwave until hot. Immediately pour over the chocolate and let sit for 5 mins.
Whisk until smooth and chill for at least 2 hours.
Use an electric mixer to beat into a frosting-like consistency and frost the brownie once cooled completely.
Recipe Notes
If desired, cut the brownie in half and layer the two halves on top of each other prior to slicing into required serving sizes.