In a bowl, combine the mascarpone cheese, heavy cream, and sugar until smooth and creamy.
Pour the Prosecco into a saucepan and gently warm it to enhance the flavors of the spices.
Lay out the strudel leaves one at a time on a clean kitchen towel. Brush each layer with a little melted butter.
Evenly spread the mascarpone cream mixture over the strudel leaves, then drizzle with the warmed Prosecco.
Carefully roll up the strudels and place them in a greased baking pan.
Whisk the egg and brush it over the top of the strudels to give them a beautiful golden-brown color while baking.
Bake in a preheated oven at 350°F (180°C) for 30-40 minutes, or until golden brown and crispy.
Let it cool slightly before serving. Slice and serve warm.
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