Crumble the yeast into the lukewarm milk, add a teaspoon of sugar and a tablespoon of flour. Leave in a warm place to proof for about 10 minutes. TIP: If it doesn't foam, start again – the milk was probably too hot or the yeast is weak.
In a large bowl, combine the flour, remaining sugar, vanilla sugar, and salt.
Add the egg, melted butter, and the proofed yeast mixture. Knead until a soft, elastic dough forms.
Cover the dough and let it rise in a warm place for 45-60 minutes, or until doubled in size.
Meanwhile, coarsely chop the brittle. If it's too hard, chill it briefly in the refrigerator, then chop with a knife or crush in a mortar.
Roll out the risen dough, sprinkle with the chopped brittle, and gently press it into the surface.
Fold the dough lengthwise, slightly overlapping one side over the other, to create the classic stollen shape.
Place on a baking sheet lined with parchment paper, cover, and let rest for another 15 minutes. Preheat the oven to 350°F (180°C).
Bake for 35-40 minutes, or until golden brown. If the top starts to brown too quickly, cover it with parchment paper.
While still warm, dust generously with powdered sugar. TIP: Brush with melted butter beforehand to help the powdered sugar adhere and keep the stollen moist.
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