Mix up some corn, beans, pasta sauce and whatever meat you choose. I usually put some casing-free lowfat chicken sausage in there as that's convenient. Takes under 10 minutes to make, is very high in protein, and lasts 2 lunches if you use a can of corn, a can of beans and 5 sausages.
Before, I used to make footlong subs with about a third of a pound of turkey meat, hummus, tomato and avocado. Those taste good, but really need to be made the day of to still be fresh, and I don't have time for that.
Do you have a Trader Joe's nearby? They have lots of premade choices that have a decent amount of protein. I usually end up having a protein bar around 11 then lunch around 1, to make sure I get enough protein and calories in.