Ah, I miss State College! I grew up there! (Still go back often- right now getting ready for the summer People's CHoice Festival- same time as arts fest, but w/ PA artists- this will be my 5th year selling- love it!)
I'm in Gettysburg but have been up w/ a friend in Harrisburg often. There are a lot of national chain places all around that area.
Ruby Tuesday has options (They will readily swap out the potatoes for other veggies if you ask.) In downtown HArrisburg there's Gingerbread Man- I went there once and just took the bun off my chicken sandwich. (I was NOT in the mood for a salad!)
My brain is frozen or I would think of more!