Valentine's Day Cupcakes

Bahan-bahan (15 porsi)

• 1 and 3/4 cups (207g) cake flour* (spooned & leveled)
• 3/4 teaspoon baking powder
• 1/4 teaspoon baking soda
• 1/4 teaspoon salt
• 1/2 cup (8 Tbsp; 113g) unsalted butter, softened to room temperature
• 1 cup (200g) granulated sugar
• 3 large egg whites, at room temperature*
• 1 and 1/2 teaspoons pure vanilla extract
• 1/2 cup (120g) sour cream or plain yogurt, at room temperature
• 1/2 cup (120ml) whole milk, at room temperature
• 1/3 cup (100g) Nutella
• 1 cup (about 25g) freeze-dried strawberries*
• 1 and 1/2 cups (340g) unsalted butter, softened to room temperature
• 6 cups (720g) confectioners’ sugar
• 1/3 cup (80ml) heavy cream or milk
• 1 teaspoon pure vanilla extract
• 1/8 teaspoon salt
• 1/3 cup (100g) Nutella
• optional for garnish: chocolate heart candies or strawberries