Preheat oven to 355 degrees F (180 degrees C).
Sift together Cake Flour (35 gram), Corn Flour (1 tablespoon), and Valrhona® Cocoa Powder (1 1/2 tablespoon) into a bowl. Mix well and set aside.
Separate Egg (2) yolks from whites and set both aside.
Combine Egg Yolks, Caster Sugar (25 gram), and Vanilla Extract (1/2 teaspoon) in another bowl, mix well.
Add Milk (80 milliliter), mix well followed by Corn Oil (25 gram) and blend well. Sift in flour mixture the second time into egg mixture and stir well again.
Beat Egg Whites until foamy. Gradually add Caster Sugar (20 gram) beat until egg whites to peak form.
Fold the egg whites evenly into into egg yolk batter with a rubber spatula in two batches. Then pour mixture into a 7 inch round cake pan, lined base with parchment paper.
Bake at second lower rack in the oven for about 15 minutes or skewer inserted comes out clean. Invert cake pan immediately and let to cool down after baked.
Invert cake pan immediately and let to cool down after baked.
Soak Gelatin Powder (1 1/2 teaspoon) in Water (1 tablespoon).
Cook Fresh Blueberries (150 gram), Caster Sugar (80 gram), and Water (2 tablespoon) in pot over medium heat.
Mash blueberries with a spatula or spoon. Then press blueberries through a strainer to extract as much liquid as possible. Blueberries liquid should be measure to around 120 gram after strained.
Return blueberries liquid to pot and lightly boil liquid together with soaked gelatin. Stir till gelatin melted, off heat and add lLemon Juice (1 1/2 tablespoon), stir well again and leave blueberry liquid mixture to cool.
Whisk Non-Dairy Whipping Cream (250 gram) to peak form but not too stiff and mix evenly into blueberry liquid mixture with a hand whisk.
Cut chocolate sponge cake into 2 slices and place one piece of it into a 8 inch round removable cake pan or adjustable cake ring and spread half of the blueberry mouse on top.
Then place the second piece of chocolate sponge cake on top, followed by the remaining blueberry mousse.
Smooth the surface with a spatula or scraper and place the whole cake in the refrigerator to chill for at least 4 hours or overnight.
Remove cake from the pan and place some fresh blueberries on top and dust with some snow powder or decorate the cake as desired before serving. Enjoy!