1 can tuna
1 onion, sliced very thin
1 small can English peas
1 can mushroom soup
grated cheese (if desired)
crushed potato chips

Spread tuna in bottom of baking dish. Add onion and peas (including juice). Spread soup over. Add cheese. Cover with potato chips.

Bake 20 minutes at 400°F.

Serves 4 to 6.