In a large mixing bowl, combine the flour, sugar, and salt. Add the butter, egg, and white wine. Knead until you have a smooth and elastic dough. Wrap in plastic wrap and refrigerate for 30 minutes.
For the filling, combine the peanut butter, mascarpone cheese, powdered sugar, and vanilla extract in a bowl. Mix with a spatula until smooth. Refrigerate for at least 30 minutes to allow the filling to firm up but remain pipeable.
On a lightly floured surface, roll out the dough thinly. Cut into 10x10 cm (approximately 4x4 inch) squares. Wrap each square around a metal cannoli form. Moisten the edges with a bit of water and press to seal, ensuring they don't come apart during frying.
Heat the oil to 350°F (180°C) in a deep pot or fryer. Fry 2-3 cannoli at a time until golden brown. Place on paper towels to drain. Once cooled, carefully slide the cannoli shells off the forms.
Using a piping bag, fill the cooled cannoli shells with the peanut butter cream. Pipe cream into both ends for an even filling. It's best to fill the cannoli just before serving to prevent them from becoming soggy.
Dust with powdered sugar before serving. The distinctive salty-sweet flavor of peanut butter pairs beautifully with the creamy mascarpone. For the best experience, consume immediately.
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