
Something on toast, cheese, eggs (scrambled,fried,poached), sardines, beans? Suppose it depends on how close you are to the visitors, if my OH's mum or something was coming to visit I'd be in a fluster and would never dream of offering something on toast in case she thought my hospitality was rubbish!
But if it was my friends something on toast is good, they can have a choice without you having to get a fridge full of stuff from the shops and you can do it quick so you can spend time with your guests instead of cooking.
Ok I've thought what I'd do, I'd make soup and fresh rolls earlier in the day. If they are hungry you can quickly heat some up and if they aren't it's not a wasted effort because you can have it the next day for lunch.