Peanut Chocolate Cake

Ingredients

• 1/2 cup butter or margarine, softened
• 2 1/4 cups packed brown sugar
• 3 eggs
• 3 (1 ounce) squares unsweetened chocolate, melted and cooled
• 2 teaspoons vanilla extract
• 2 1/4 cups all-purpose flour
• 2 teaspoons baking soda
• 1/2 teaspoon salt
• 1 cup sour cream
• 1 cup water
• 1 cup butter or margarine
• 1 cup peanut butter*
• 4 cups confectioners' sugar
• 1/4 cup milk
• 1 cup finely chopped peanuts