Peanut Butter whoopie pies Recipe

• Cookies:
• 3 1/2 cups All purpose flour
• 1 1/2 cups unsweetened cocoa powder
• 1 Tablespoon baking soda
• 1 Teaspoon baking powder
• 1 cup (2sticks) butter
• 2 cups sugar
• 2 large eggs
• 2 cups buttermilk
• 2 teaspoons vannila extract
• Frosting:
• 1 1/2 cups smooth peanut butter
• 1 cup butter
• 1 1/2 cups confectioners sugar
• salt

Directions