Martha Washington Pie

INGREDIENTS

• 1 cup butter, softened
• 2 cups white sugar
• 2 eggs, lightly beaten
• 1 teaspoon vanilla extract
• 1 tablespoon unsweetened cocoa powder
• 2 teaspoons baking powder
• 1 cup milk
• 2 cups all-purpose flour
• 3/4 cup golden raisins
• 1 cup chopped walnuts
• 2 (9 inch) unbaked pie crusts
• 1 cup confectioners' sugar
• 1/2 teaspoon vanilla extract
• 4 tablespoons milk