Melt the white chocolate in a saucepan over a hot water bath. Add the butter and let it melt. Let cool.
Beat the eggs, sugar, vanilla sugar and salt until lightly foamy. Sift the flour on the egg mixture and fold in slightly. Brush the silicone molds with a little oil. Preheat the oven to 180 degrees. Fill the mold two-thirds with batter and bake for 15-20 minutes. After 15 minutes, turn a mold out to test the consistency of the cake. If necessary, bake for another 2-5 minutes.
Arrange white chocolate lava cakes on plates. For decoration, place a cake fork on the edge of the plate and sprinkle with cocoa powdered sugar.
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