Cover potatoes with water; add salt and cook until they can be pierced with a fork. Don't overcook. Pour off about half the water. Break up potatoes slightly. Add margarine and Half & Half. Season to taste with salt and pepper.
VARIATION: Add one package of imitation crab meat (cut into small chunks) and a can of drained whole kernal corn to make a delicious chowder. Give it some Cajun flavor with 1/2 teaspoon of Louisiana Spice.