I previously uploaded a recipe titled [Inexpensive & Filling Chicken Breasts! Juicy Fried Chicken] Recipe ID: 1924347. I took this and reduced some of the ingredients slightly and then made it into an easy-to-freeze amount. If this recipe makes too much for you, then half everything.
Since this is for bento, if you're worried about the garlic, then just add a small amount in or you can completely omit it all together. You add in shichimi spice, but it's just an accent, so it's not going to be overly spicy. Adjust it if your children are going to be eating this.