Cut the top and bottom of the onions, wrap them in plastic wrap, and microwave at 600W for 5 minutes. Let them cool and scoop out the insides with a spoon.

Thinly slice the scooped-out onion insides. Peel and thinly slice the potato, then soak in water and drain. Cut the ham into thin strips.

Place the potatoes and ham in a microwave-safe container, cover loosely with plastic wrap, and microwave at 600W for 4 minutes. Add the ☆ ingredients and mash the potatoes while mixing.

Add the sliced onion insides to the mixture, cover loosely with plastic wrap, and microwave at 600W for 2 minutes. Mix well to create the filling.