Vegan Avocado Brownies

Name: Vegan Avocado Brownies
Prep time: 7 min
Cook time: 25 min
Total time: 32 min
Cuisine: American
Ingredients: 1 ripe, medium-sized avocado see notes; 140g / 1 cup plain, all-purpose flour; 1 teaspoon baking powder; ¼ teaspoon salt; 50g/ ½ cup raw cacao powder see notes; 110g / ½ cup brown sugar (add ¼ cup / 50g more for sweeter) see notes for unrefined sugar options; 125ml/ ½ cup plant-based milk see notes; 80g/ ½ cup vegan chocolate chips optional, see notes; a handful walnuts optional