In a bowl mash the banana until very creamy. Whisk in buttermilk, egg white, almond and vanilla extract.
In a separate bowl, mix dry ingredients, except blueberries, until well combined. Add banana mixture and mix well with a spatula until well incorporated. Delicately fold in blueberries.
Transfer to a microwave safe bowl, or dessert cup, cover with a paper towel and microwave about 2 minute and 30 seconds to 3 minutes, depending on desired level of doneness and microwave strength.
While cake is cooking, mix plain yogurt together with whey protein powder to make vanilla custard. It might look like there is too much powder at first, but it will come together eventually. Same goes for the “lumpy” feeling. Just let the custard rest for about a minute and it will become nice and smooth.
When cake is done, top with custard, blueberries, almonds, coconut shavings and liquid honey.