Ground beef and onions are good to add in to the stroganoff. Brown the beef, stir in some chopped onion, drain it at some point, then add in the mix according to the directions. I got through college doing exactly that for 50% of my meals.
And as Intaglio already suggested, ham and peas are good add-ins for the Alfredo. I’m not proficient enough in the kitchen to do anything with bone-in chicken, and the filets are always way too expensive to be worthwhile for me, so I never used chicken unless it was the version in a can (which is only really good for chicken salad). Using ham doesn’t have to be that big an effort; I just cut a few pieces of sliced ham into smaller bits and fried them, then mixed them in – the end result was somewhat bacon-ish. Also, dicing a tomato and adding it at the end can go a long way.
Until I read this, I’d forgotten how much a stable those two varieties of Noodles & Sauce were to my college diet. Most of the time I’d just make it as-is, with a single-serving can of peas and/or corn on the side, and that was plenty filling, and cheap. Plus, they’ve got plenty of sodium, which is something my body needs anyway. I like that.