One Bento, Main dish, Side dish, and Snack recipe with Arugula, Chicken breast, and Dried onion made by Mixing

Cheese and mushroom casserole with chicken

This casserole is simple and delicious, and makes a perfect snack during a picnic (bento anyone?)—you should use it as a basic idea for a casserole, since the pasta sauce is the stable and the most important piece of the meal. It's also a very tweak-able recipe! :-)