Clean the crab and cut it into bite-sized pieces.
Slice the onion, green onion, and red chili thinly.
Heat cooking oil in a pan and stir-fry garlic and ginger.
Add the prepared crab and stir-fry over high heat.
Add curry powder, oyster sauce, fish sauce, and sugar, then mix well.
Add the vegetables and stir-fry together.
Mix eggs and milk (or condensed milk), pour into the pan, and stir quickly until cooked.
Once everything is evenly cooked, plate and serve.