Grease a small dessert bowl, ramekin or disposable cup with butter.
Break egg into a bowl and pierce yolk with a fork. (Piercing is necessary to prevent "exploding" during cooking.). Sprinkle little, salt, pepper and oregano on top of the egg.
Cook it in a microwave for 90 seconds. Demold it on a plate.
Spread 1 tbsp burger mayonnaise on each half of burger bun.
On bottom, half of burger bun place cooked egg, onion slices, add a dollop of mayo and top it up with other half of the bun. Serve
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