Shred the crab sticks into small pieces.

Chop the onion finely.

Heat butter in a pan over low heat and sauté the chopped onion.

Add flour to the pan and mix well with the onion.

Pour milk into the pan and stir to dissolve the flour completely.

Add the shredded crab sticks to the mixture and cook together.

Continue stirring until the mixture thickens and forms a cohesive dough.

Transfer the dough to a container and refrigerate for 30 minutes to 1 hour.

Cut the chilled dough into desired shapes and coat with flour, egg wash, and breadcrumbs.

Shape the croquettes into your preferred forms, such as round or square.

Heat oil in a pan and fry the croquettes until golden and crispy.