Place your mascarpone cheese in a stand mixer and whip using the whisk attachment. Start with it on low and gradually increase the speed until your cheese is light and fluffy. (If you choose to add any extra sugar, vanilla, or other flavors, do that now.) Let it stand for a few minutes before putting into your crust.
Slice your peaches.
Scrape your whipped cheese into your prepared graham cracker crust and top with sliced peaches in an overlapping, circular pattern.
Carefully slice and savor!
Option: you can also drizzle with a bit of local honey and sprinkle some thyme or basil ribbons onto your tart.