One Bento, Cakes, Dessert, Side dish, and Snack recipe with Arugula, Champignons, Cucumber, Dried onion, Egg whites, Mirin, Smoked salmon, Strawberry jam, and Sweet potato made by Baking for Gluten-free, No eggs, and No wheat diet

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! :-)