Preparation:
Step: 1
In the bowl of the bread machine, pour the milk, melted butter, sugar and beaten egg. Add the flour and yeast. Start the dough program.
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Step: 2
In a salad bowl, whisk the yolks with the sugar and cornstarch. Gradually add the warm milk and vanilla. Cook over medium heat until thickened.
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Step: 3
Remove your risen dough from the machine. Roll it out into a large rectangle 5 mm thick, on a floured work surface.
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Step: 4

Spread half of the rectangle with pastry cream and then spread the chocolate chips.
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Step: 5
Fold the dough in two and press the edges to seal them well.
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Step: 6
Cut strips 4 cm wide.
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Step: 7
Place the buns on a baking sheet and brush them with egg yolk. Leave to rise for 1 hour in a warm place.
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Step: 8
Bake for 12 minutes in the oven preheated to 180°C.