In a large bowl, combine flour, baking powder, baking soda salt and spices.
Another bowl, combine brown sugar, lemon juice, egg yolk, mashed banana, oil, Greek yogurt/butter milk and vanilla extract. Whisk until combined
Beat the egg white with 1 table spoon of icing sugar until soft stiff peak form
Fold in the dry ingredients mixture in 2 batch & fold gently, then fold in the egg white in 3 batch & fold gently just to combine.
Grease 8 inch pan and pour the batter into it. Pour the batter & arrange banana slice
Bake in 350 F (175 C) oven for 45 minutes, or until a toothpick inserted in the middle of the cake come out clean. Let cool for about 5 minutes in the pan.
