Best Chocolate Hazelnut Mille Feuille Recipe

Ingredients

• 1 ½ cups whole roasted hazelnuts, plus more for garnish
• 2 ½ cups fairlife ultrafiltered whole milk, plus more to top up
• 4 large egg yolks
• ½ cup granulated sugar
• ¼ cup cornstarch
• ½ tsp salt
• 4 Tbsp unsalted butter, room temperature
• 5 oz semi-sweet chocolate, chopped
• 1 ½ tsp vanilla extract
• 2 sheets store-bought puff pastry, thawed
• Flour, for dusting
• ½ cup heavy cream
• ¼ cup icing sugar
• 2 cups icing sugar
• 4-5 Tbsp fairlife ultrafiltered whole milk
• 2 tsp cocoa powder