I use hard boiled eggs as a grab and go snack. Make a big batch of pancakes or waffles, freeze them individually, then bag them up and use like eggos. Muffins are always a good bet, too. There are millions of muffin recipes, so you can find some that suit your tastes. Make a couple dozen on the weekend, it will take about an hour total, and then dole them out during the week.