01 - Toss peach slices with lemon juice and sugar in a bowl. Set aside for 10 minutes to macerate and release juices.
02 - In a large mixing bowl, whip the heavy cream until soft peaks form.
03 - Combine mascarpone cheese, sugar, and vanilla extract in another bowl. Mix until smooth.
04 - Gently fold whipped cream into mascarpone mixture until fully combined and creamy.
05 - Combine peach juice and schnapps (if using) in a shallow dish.
06 - Quickly dip each ladyfinger into peach juice mixture, ensuring moistening without sogginess.
07 - Arrange half soaked ladyfingers in single layer at bottom of 9x7 inch serving dish. Spread half mascarpone cream over ladyfingers, top with half sliced peaches.
08 - Repeat with remaining soaked ladyfingers, remaining cream, and remaining peaches.
09 - Cover and refrigerate at least 4 hours, or overnight, to meld flavors. Garnish with fresh mint leaves before serving.