My "must-have" is an electric skillet. I'm definitely a gal who likes her electricity when camping.
I can make pancakes, eggs, bacon, grilled cheese, dirty rice, stir-fry, etc in it. I also think you can do biscuits and cakes in it but I haven't tried those yet.
Oh, and another vote for fried bread (which you can do in the aforementioned electric skillet). Yum. We have one of the 4 slice pop-up toasters that goes over the burner. It was maybe $5 at Bass Pro or Walmart. I'd say even if it gets rusty in 10 years, that's a pretty good amortization. Oh, and we don't wash ours, just dust the crumbs off and store. It's only about 2 years old so no signs of rust yet.