**Preheat Oven and Prepare Tins:** Preheat your oven to 350°F (175°C). Lightly grease a mini tart tin or use individual mini tart pans.
In a bowl, mix the crushed chocolate cookies with melted butter until well combined. Press the mixture into the bottom and up the sides of each tart tin to form a crust. Bake for 5-7 minutes. Allow to cool completely.
Heat the heavy cream in a saucepan over medium heat until it just begins to simmer. Remove from heat and add the chopped chocolate, vanilla extract, and salt. Let sit for a minute, then stir until the chocolate is completely melted and the mixture is smooth.
Pour the chocolate filling into the cooled crusts. Refrigerate the tarts for at least 2 hours or until the filling is set.
Once set, arrange fresh berries and sliced kiwi on top of each tart. Add a mint leaf for a decorative and flavorful touch.
Let the tarts sit at room temperature for a few minutes before serving for the best flavor and texture.