Mocha Nutella Cupcakes

Bahan-bahan (12 porsi)

• 1 and 1/4 cups (156g) all-purpose flour (spooned & leveled)
• 2 teaspoons baking powder
• 1/4 teaspoon salt
• 6 Tablespoons (85g) unsalted butter, softened to room temperature
• 3/4 cup (150g) granulated sugar
• 3 large egg whites, room temperature
• 1 teaspoon pure vanilla extract
• 6 Tablespoons (85g) full-fat sour cream, room temperature
• 3 Tablespoons (15g) instant espresso coffee powder
• 2 Tablespoons (30ml) hot water
• 6 Tablespoons (90ml) whole milk, room temperature
• 1 cup (16 Tbsp; 226g) unsalted butter, softened to room temperature
• 4 cups (460g) confectioners’ sugar
• 3/4 cup (225g) Nutella
• 1/3 cup (80ml) heavy cream or whole milk
• 1 teaspoon pure vanilla extract
• pinch salt
• optional: chocolate sprinkles and raspberries