Preheat oven to 180 degrees C. Lightly grease a casserole dish.
Spread 1 cup crushed potato chips evenly on bottom of casserole dish. Next, layer 1 can of tuna, half of the peas and half of the soup. Place slices of cheese on top of this. Repeat layering with tuna, peas and soup. Finish with a layer of chips, and top with slices of cheese.
Bake in preheated oven for 20 to 25 minutes, or until bubbly and golden brown.