Preheat oven to 350°F (175°C) and grease a loaf pan.
Mash bananas in a bowl until mostly smooth.
Add sugar, coconut oil, espresso, vanilla, and non-dairy milk. Stir well.
In another bowl, mix flour, baking soda, cinnamon, and salt.
Combine the wet and dry ingredients until just mixed.
Gently fold in chopped walnuts.
Pour batter into the prepared pan.
Bake for 50 minutes or until a toothpick comes out clean-ish.
Let cool for 15 minutes in the pan, then transfer to a rack.
Whisk glaze ingredients together and drizzle over the cooled loaf like you mean it.