Line the loaf pan with parchment/baking paper and a light spray of spray oil.
Peel bananas and place in bowl. Use a fork or whisk to mash the bananas well until there are no large chunks.
Add in the egg, oil, buttermilk / milk and brown sugar. Whisk well.
Add in the rest of the ingredients (flour, bicarb soda, baking powder, salt).
Mix well until the mixture just comes together and there are no longer any clumps.
Pour the batter into the donut pan.
Banana donut is is done when you place a toothpick in the thickest part and it comes out clean.
Allow to cool down completely.
Cream Cheese Glaze
Combine the cream cheese, milk and powdered sugar in a bowl.
Mix well until combined. Add addition milk to smoothen and loosen the glaze. The glaze should be thick like pancake batter so it is easy to spread.
Place the donuts on a wire rack or parchment paper. Spoon the glaze onto each donut. Set aside for the glaze to harden.
Notes
Storage: Banana bread can be stored in an airtight container for 3-4 days at room temperature. Banana bread can also be stored in the freezer for 3 months. Wrap it well and place in an air tight freezer safe container.