Combine all ingredients except for the filling in a blender and blend until combined.
Heat the Fish Waffle Maker on medium heat and spray with non-stick cooking oil. Once heated, add a small amount of batter to the waffle maker (about half the amount) and let cook for about 1-2 minutes.
Add 1 tbsp of filling on top of the batter and top with more batter mixture on top to cover the fish mould.
Close the waffle maker and quickly flip over.
With the waffle maker still closed, cook for about 4 minutes.
Quickly flip over the waffle maker again and check to see if cooked through.
The bungeoppang should be golden brown and easily removed from the waffle maker.
Set the bungeoppang aside let cool for a few minutes before serving.
Enjoy!