Peanut Butter Hi-Hat Cupcakes

Bahan-bahan (12 porsi)

• 1 batch homemade chocolate cupcakes
• 3 egg whites, room temperature
• 3/4 cup (150g) granulated sugar
• 1/4 teaspoon cream of tartar
• 10 Tablespoons (142g) unsalted butter, very soft (not melted)
• 1 cup (250g) creamy peanut butter (not natural style)
• 1 teaspoon pure vanilla extract
• pinch salt
• 10 ounces (280g) semi-sweet chocolate, coarsely chopped*
• 1 and 1/2 Tablespoons canola or vegetable oil