I always used to watch my mother cooking delicious things since I was small. My mother used to make bentos for me every day when I was in high school, which always had tamagoyaki in them! As long as I had this tamagoyaki, I just needed some furikake with my rice and I was happy. Now I always include it in my children's bentos.

If you're making this for a bento, you're busy in the morning so make it quickly over high heat instead of working on it slowly. If you lift up the frying pan periodically to distance it from the heat, you won't burn the tamagoyaki.
Also, we've always used Kewpie mayonnaise in our family since my mother's time. (This is important I think.) Recipe by yumeko mama