You may want to scour the IP packet recipes on the forum - there are tons of recipes for muffins, cookies and portable foods out of the unrestricted packets.
cookies or muffins need up-front prep time but you can make them ahead-of-time
Exactly!! Preparation is half the battle on IP! You can make cookies from the drink mixes, muffins from the pudding, and mini pancakes from the Crispy Cereal (I used to do this often as a snack and I brought a little container of WF pancake syrup for dipping!). Set yourself up with a few days' worth in ziploc bags and you will be ready for anything!
The IP potato puree makes a fantastic potato pancake that you can use to make a veggie wrap. I take it to work all the time and it's sort-of grab-and-go, once it's made Non restricted, too, which is awesome.