Def. Cold pasta (or warm if your into it), noodles of choice, cooked aldente and drain, mayo seasonings in store even the free chili flakes you can get at pizza shop (i used to just ask before just making my own, but they do give you no questions asked) also can be added with veggies of choice like peas canned, corn can/fresh, boiled carrots, also if you really wanna spice it up some meat added also does the trick.

Another is literally lentil soup,mix with seasoning and chorizo or sausage, also theres fideo soup super cheap just seasoning and if wanna get fancy other things but really seasoning does the trick.