Mexican Potatoes Great with barbecue!

4 to 5 medium potatoes
1/4 cup finely chopped onions
1/2 cup half & half
1/4 cup chopped pimentos
1/4 cup chopped green peppers
1 cup mayonnaise
1 teaspoon salt
1/2 teaspoon black pepper
1/2 cup grated American cheese

Topping:
1/2 to 3/4 cup of grated American cheese
1/2 cup chopped green and black olives

Boil potatoes; peel, cool, and slice medium thick. Combine onions, pimentos, green peppers, half & half, mayonnaise, salt, pepper, and cheese. Pour over potatoes and mix thoroughly. Butter bottom and sides of a shallow 9x13 baking dish. Place potato mixture in dish. Sprinkle top with cheese and olives. Bake in 375°F. oven for 20 to 25 minutes. Serves 6.