Put bananas into a bowl, blend roughly until there are no chunks but not to watery. Different bowl adding 85g cake flour 4g baking powder 1~2g cinnamon 0.5g salt and mix it

In a mixing bowl adding 2 eggs at room temperature, beat the eggs at high speed for 5 minutes and then pouring melted butterand keep beating at low speed dripping warm melted butter gradually.

Using a hand whisk whisking the egg mixture and smash banana. Add the mixed powder through the sieve and mix lightly until can't see flour. Adding chopped finely walnuts, remain little big grains to feel walnut into the cake with vanilla extract, mix thoroughly..

Pour the batter from high to remove the large bubbles.
Convection oven : preheat 338F bake 320F for 35minutes/Convectional oven : preheat 356F bake 338F for 35minutes. Let it cool and cut into 3 sheets about 1.5cm thick

Bring to boil the milk with vanilla bean on medium-low heat. Meanwhile, loosen egg yolks and then add sugar whisk until pale. After that adding flour and mix it. When start boil from the edge, turn off the heat.

Pour little of vanilla milk and whisk it continuing Pour all milk into mixture. Pour back to the milk pot through the sieve.,boil it on the medium-low heat,don't stop stirring. When it starts to thicken, turn down to very low heat. checkingthe bubbles pop for a second and then stir it for 1 minute and let it cool completely by cover with the plastic wrap.

Use cold mascarpone cheese got out of the fridge and loosen it.Adding little heavy cream first and mix. And then pour all of it and mix. Adding 40g sugar, whiping at the medium speed just until it starts thickening about 60% whipped. Will reserve 200g the cream for icing and put in the fridge. Continue place the ice bowl under the whipped cream bowl, whipped until stiff pick.

Place sheet of cake and brush sugar syrup on and piping cream on top around the edge next piping half custard cream in middle all surface and then spread surface until smooth and placed second one and then repeat like that. Placed the last sheet on top and spread to have a smooth layer cake. Keep in the fridge for 10 minutes.

Take out 200g remained ceam adding yellow color to become pastel put all ove cake and spread evenly