Drain the oil from the canned tuna and bring butter to room temperature.

Mix the filling ingredients (cheese, tuna, mayonnaise, salt, and pepper) in a bowl.

Cut a slit into each chikuwa stick, stuff with the filling, and cut into bite-sized pieces.

In a bowl, mix the egg, yogurt, and butter. Add pancake mix and knead until a dough forms. Divide into equal portions.

Grease your hands with vegetable oil, flatten each dough portion, place a stuffed chikuwa piece on top, and wrap to form a ball.

Place the dough balls on a baking sheet lined with parchment paper. Brush the surface with beaten egg, cut a shallow cross on top, and add a dollop of mayonnaise.