Preheat the oven to 150°C / 300°F. Combine all of the ingredients for the cookies.
Place cupcake molds on a baking sheets and spread the batter evenly among them. Bake in the center of the oven for 10 minutes. Remove and allow to cool.
Make the “buttercream” by mixing dates, cacao, vanilla and salt until you have a smooth and creamy filling. Remove the cookies from the muffin molds and place a spoonful of buttercream on each one. Shape into a dome with a spoon and chill in the freezer for about 10 minutes.
Melt dark chocolate. Take out the cookies and dip the buttercream side of each one in the chocolate. Then pop them back into the freezer to harden.