01 - Finely chop cocoa butter and melt gently in a heatproof bowl placed over simmering water, stirring until fully liquid.
02 - Sift powdered sugar, cocoa powder, and milk powder together to remove any lumps.
03 - Gradually whisk sifted dry ingredients into melted cocoa butter until smooth and fully incorporated.
04 - Stir in fine sea salt and vanilla extract evenly.
05 - Pour mixture into silicone chocolate bar molds or a lined baking dish, tapping gently to eliminate air bubbles.
06 - Refrigerate for 30 to 45 minutes or until completely firm.
07 - Remove set chocolate from molds, break or cut into desired pieces, and store in an airtight container in a cool place or refrigerator.