1: Pre-heat oven to 350 degrees F.
2: Grease a 6 cavity donut pan.
3: In a large bowl, mash the banana until few lumps remain.
4: Stir in the almond milk, nut butter, maple syrup, and vanilla extract until well combined.
5: Sift together the flour, baking soda, baking powder, salt, cocoa powder, and cinnamon over the wet ingredients and mix together.
6: Evenly spoon or pipe the mixture into the muffin cups.
7: Bake in oven for 15-20 minutes or until a toothpick inserted in the middle comes out clean.
8: Let cool slightly and then remove from the pan to a wire rack.
9: For the frosting, melt the dark chocolate and coconut oil in a small bowl until just melted.
10: Whisk in the powdered sugar and plant based milk, adding more milk as needed for desired thickness.
11: Dip each cooled donut into the frosting and add sprinkles as desired.