Boil eggs in boiling water for 7 minutes. Cool in ice water, then peel.

Wash potatoes and wrap them in wet plastic wrap. Microwave at 500W for 5 minutes.

Peel potatoes and mash until smooth.

Mince onion and microwave at 500W for 3 minutes.

Combine mashed potatoes, onion, chopped ham, mayonnaise, and salt and pepper in a bowl. Mix well.

Divide the mixture into portions. Place a boiled egg on each portion and shape into croquettes using plastic wrap.