Preheat oven to 350°F.
Mix wet ingredients in one bowl and dry ingredients in another.
Combine wet and dry ingredients until smooth with no clumps.
Pour batter into a sprayed or parchment-lined loaf tin.
Bake for 40-45 minutes, slightly underbaking for a softer texture.
While baking, mix frosting ingredients and refrigerate for 10 minutes.
Frost brownies, add toppings, and chill 10+ more minutes if desired.
