Preheat the oven to 210° C. Knead butter, sugar, vanilla, eggs, salt and flour into a smooth dough. Put it in the fridge for about 10 minutes.
Grease the tartlet-moulds with some butter and dust with some flour. Fill them with the dough and prick the dough with a fork. Bake the tartlets for about 10-12 minutes.
Let the tartlets cool while you start making the filling: Whip the cream until stiff. Combine yogurt, lemon zest and juice and sugar. Soak gelatine leaves in cold water. Warm up about 3 tbsp. of the yogurt and dissolve the gelatine in it. Add the yogurt-gelatine-mix to the rest of the yogurt-cream. Fold the cream into the yogurt and pour the filling on top of the tartlets. Put in the fridge for about 2 hours and decorate with peach slices.
Tipps
You can also use mascarpone instead of yogurt and cream.