Chocolate peanut butter cake: A rich and decadent treat

Ingredients

• 1½ cups sugar
• 1 cup flour
• ½ cup cake flour
• 1 cup unsweetened cocoa powder
• 1½ tsp baking powder
• 1 tsp baking soda
• ½ tsp salt
• 1 cup cold butter, cut into pieces
• 4 eggs
• 1 cup sour cream
• 2 tsp vanilla
• ½ cup butter, softened
• ⅔ cup peanut butter
• 3-4 cups powdered sugar
• 1 tsp vanilla extract
• 1-2 tbsp milk
• 1 pinch salt