Cut the soap base into small cubes and place them into a microwave-safe jug. Add in the shea butter.

Melt the soap cubes in the microwave set on low in 30-second bursts (or use a double-boiler) and stir gently in-between until the soap is liquid. Melted soap can be quite hot, so be careful to avoid burns.

Add the essential oils and mica powder (if using). Whisk until well combined.

Place the silicone mould on a tray or cutting board.

Spritz with alcohol and sprinkle the bottom with lavender buds.

Slowly pour the soap into the mould.

Spray the top of each soap with alcohol to dissolve the bubbles. Sprinkle with additional lavender flowers.

Place in the fridge for 30 minutes or until the soap feels hard. You can skip this and wait 2-3 hours until the soap bars feel hard.

Once the soap is fully hardened, gently flex the mould to release the soap bars.