Add all brownie base ingredients to a food processor, and run until mixture pulls away from the sides (a "dough" will start to form).
Empty contents into an 8 x 8 baking dish lined with parchment paper. Press/pull brownie mixture to the edges of the pan- this can be done easily by placing a sheet of parchment paper on top of the mixture, and then pressing on top with your hands (this prevents you from getting your hands covered in chocolate too!).
For the topping, mix all ingredients in your food processor (no need to rinse- just makes sure there aren't pieces leftover from the brownie base) until smooth and thick. *TIP: If icing seems too runny, add a touch more powdered sugar- if it seems too dry, add a splash of almond milk. Pour on top of brownies and spread evenly across the pan.
Eat immediately OR refrigerate 15 minutes to harden up. Cut into bite-sized squares. Enjoy!
*If making gluten-free, please make sure to check that your powdered sugar is gluten-free verified.