I found these on another site for weight loss actually and found they work perfect for a protein punch and can freeze for a quick toss in the lunch on the way out the door. It's not really japanese at all but it works perfect for my americanized bentos I think. You will need Ham slices eggs shredded cheddar salt/pepper to taste muffin cups/pan 1 egg will produce 2 egg cups so plan your ingredients around how many you will make. line each muffin cup with a slice or two of ham (depending on how thin it's sliced). Scramble the eggs, salt and pepper until nice and fluffy then stir the shredded cheese. I generally add a few pinches per egg. Pour the egg mixture into your ham lined muffin cups and bake at 350 until eggs are cooked through. I normally eat one and toss the second into the freezer. It gives me a meal and a spare.