Cut the potatoes into cubes and soak them in water for 5 minutes. Drain the water and place the potatoes in a microwave-safe container. Cover loosely with plastic wrap and microwave at 600W for 4 minutes. Drain any excess water.

Mash the warm potatoes until smooth. Add shirasu, mayonnaise, and a pinch of salt and pepper. Mix well and divide into 6 equal portions.

Place a dumpling skin into each silicone cup. Fill each with one portion of the potato mixture. Sprinkle dried parsley on top. Repeat for all 6 cups. Drizzle 1/6 tsp of olive oil around the edges of each dumpling skin.