Peanut Butter Fudge Cake

INGREDIENTS

• 2 cups all-purpose flour
• 2 cups white sugar
• 1 teaspoon baking soda
• 1 cup butter
• 1/2 cup unsweetened cocoa powder
• 1 cup buttermilk
• 2 eggs, beaten
• 1 teaspoon vanilla extract
• 1 1/2 cups creamy peanut butter
• 1/2 cup butter
• 1/4 cup unsweetened cocoa powder
• 1/3 cup buttermilk
• 4 cups sifted confectioners' sugar