1. Preheat the oven to 350°F.2. In a robot, mix the butter and the 2 sugars until the preparation is foamy. Add the egg and vanilla and mix. 3. Add the flour and baking powder and mix quickly. Finish with the chocolate and mix delicately.4. With a spoon, form small balls of dough. Place on a baking sheet covered with parchment paper.5. Bake for 12 minutes.6. Remove from the oven and let cool on a grill.7. To prepare the ganache, chop 250g of chocolate. In a small saucepan, heat the cream until boiling. Pour over the chocolate and mix delicately until the preparation is smooth. Let cool to room temperature.8. Glaze half of the biscuits with strawberry jam. Top with ganache and glue a second biscuit on top.9. Repeat for all biscuits and serve.