Start with 1-2 tbs. of mayo, a drained can of salmon (tuna would work, too, but I like changing it up with the salmon and some shakes of garlic powder, dill and pepper. Mix so it sticks together pretty well. Spread on English muffin halves. Sprinkle with shredded cheese.
Toast in a toaster oven (or regular oven, if you don't have a toaster oven) until the cheese melts and bread is toasty. Enjoy!