Why didn't I know this easy recipe before! soft chocolate sandwich recipe

Why didn't I know this easy recipe before! Soft chocolate sandwich recipe
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Material :
3 egg yolks
40 grams milk
40 grams cooking oil
1/2 teaspoon vanilla extract
60 grams cake flour
10 grams cocoa powder
Meringues:
3 egg whites
1/2 teaspoon lemon juice
60 grams sugar
Cream Ingredients:
100 grams whipped cream
1/2 tablespoon sugar
50 grams cream cheese (optional)
Baking size 25x23 cm
Egg weight including shell, total 190 gram (using big egg), small egg is ok.
Preheat the oven for 10-15 minutes before the dough comes in
Bake at 190°C for 20 minutes
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