Ultimate Peanut Butter Dream Cake Elvis Would Approve

Ingredients

• 2 1/2 cups (300g) all-purpose flour, spooned and leveled
• 1 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 1 cup (227g) unsalted butter, softened
• 1 1/2 cups (300g) granulated sugar
• 1 cup (240g) creamy peanut butter (such as Skippy or Jif)
• 3 large eggs
• 1 teaspoon vanilla extract
• 1 1/4 cups (300ml) buttermilk
• 3 cups (360g) powdered sugar, sifted
• 1 cup (240g) creamy peanut butter
• 1/4 cup (60ml) heavy cream
• Pinch of salt
• Chopped peanuts (Optional)
• Peanut butter cups, halved (Optional)