Mince the onion and microwave it in a heatproof container covered with plastic wrap at 600W for 1 minute. Drain excess water and let it cool.

In a bowl, soak breadcrumbs in milk.

Combine all 'Hamburg Patty' ingredients in a bowl and mix until sticky. Divide into 6 portions.

Place each portion into aluminum cups, create a small indentation in the center, sprinkle with breadcrumbs and powdered cheese. Arrange on a baking tray.