Prepare Molds: Place your silicone chocolate molds on a flat tray to ensure they are stable and ready for use. This tray will make it easier to transfer the molds from the kitchen counter to the refrigerator.
Crush Berries: Crush the freeze-dried berries using a mortar and pestle, or in a bowl with the handle of a wooden spoon. Aim for a mix of finer pieces and some larger chunks for texture.
Add Berries to Molds: Evenly sprinkle the crushed berries into the chocolate molds.
Set Up Double Boiler: Prepare a double boiler by placing a heatproof mixing bowl over a pot of simmering water.
Melt Cacao Butter: Add cacao butter wafers to the bowl and gently melt over low-medium heat, stirring occasionally until completely melted.
Add Powdered Sugar: Add the sifted powdered sugar to the melted cacao butter. Whisk until well combined and smooth, ensuring no lumps remain.
Incorporate Vanilla: Whisk in the vanilla.
Prepare for Pouring: Pour the chocolate mixture into a heatproof measuring or pouring jug.
Fill Molds: Carefully and slowly pour the chocolate into the molds, filling them up to the inner brim to prevent spilling. If there is leftover mixture, it can be used in subsequent batches.
Refrigerate to Set: Place the tray with the filled molds into the refrigerator and allow the chocolate to set completely, about 30 minutes - 1 hour, depending on the thickness of the bars.
Unmold Chocolate: Once set, remove the molds from the refrigerator. Gently peel the silicone mold away from the chocolate bars.
Store: Place the chocolate blocks in an airtight container and store in the refrigerator for up to 2 weeks.