Start making the crust by mixing all the crust ingredients in a bowl. The produced mixture is similar to breadcrumbs.
Place spoonfuls of the crust on the cups and flatten it on the base. Put in the refrigerator for at least 30 minutes.
Stir together all the filling ingredients in a bowl; exclude the berries. Pour this mixture on the crusts. Gently drop the berry slices. Replace the cups in the fridge for an additional 30 minutes before serving. Top with mint leaves and enjoy while cold.