You don't buy maruboro anymore, do you?
When my child was in kindergarten, the mother of a student I was friendly with moved away due to a job transfer. She used to make these nostalgic boro for me, so I recreated that flavor.

The key may be using brown sugar instead of white.
Adjust the sweetness with the amount of brown sugar.
Even if you spread the batter out thinly, it will puff up in the middle.
Even if you add a lot of topping, the cookie will still puff! For 12 10 cm [3.9 in] diameter cookies. Recipe by inyako