Strawberry Puff Pastry Triangles

2. Brush the triangles with the egg yolk + milk and sprinkle with sugar. Cover them with another triangle and brush with egg yolk + milk.
3. Transfer the triangles to the parchment-lined baking sheet. Transfer to the oven and bake at 180°C/360°F for 20 minutes.
4. To make the filling, add the mascarpone, powdered sugar, crème fraiche and vanilla extract to the bowl and mix with an electric mixer until well combined and creamy.
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