For the Cake:

• 1 1/2 cups all-purpose flour
• 1 cup granulated sugar
• 1/3 cup unsweetened cocoa powder
• 1 tsp baking soda
• 1/2 tsp salt
• 1 cup warm water
• 1/3 cup vegetable oil
• 1 tbsp white or apple cider vinegar
• 2 tsp vanilla extract

For the Peanut Butter Filling:

• 3/4 cup creamy peanut butter
• 1/2 cup unsalted butter, softened
• 1 1/4 cups powdered sugar
• 1 tsp vanilla extract
• 1–2 tbsp milk (as needed for consistency)

For the Chocolate Ganache:

• 3/4 cup dark chocolate chips
• 1/2 cup heavy cream

For Topping:

• 2 tbsp peanut butter, melted for drizzle
• Crushed roasted peanuts or peanut butter cookie crumbs (optional)