Peanut Butter Cupcakes

Bahan-bahan (14 porsi)

• 1 and 1/4 cups (156g) all-purpose flour (spooned & leveled)
• 1/2 teaspoon baking soda
• 1/4 teaspoon salt
• 1/2 cup (120ml) canola or vegetable oil*
• 1/2 cup (125g) creamy peanut butter*
• 1 cup (200g) packed light or dark brown sugar
• 1 large egg, at room temperature
• 1/3 cup (80g) sour cream, at room temperature
• 1 and 1/2 teaspoons pure vanilla extract
• 3/4 cup (180ml) whole milk, at room temperature*
• 1/3 cup (40g) very finely crushed or chopped peanuts*
• 1 cup (16 Tbsp; 226g) unsalted butter, softened to room temperature
• 3 and 1/2 cups (420g) confectioners’ sugar
• 1/2 cup (41g) unsweetened natural or dutch-process cocoa powder
• 3 Tablespoons (45ml) heavy cream or milk
• 1/3 (80g) cup creamy peanut butter*
• 1 teaspoon pure vanilla extract
• 1/4 teaspoon salt
• optional for garnish: mini Reese’s Peanut Butter Cups or chopped peanuts