Boston Cream Cupcakes (Easy, Classic, Pastry Cream Filled, Chocolate Glazed) - Zest Plate

Ingredients

• Cupcakes: 6 tbsp unsalted butter, room temperature.
• 3/4 cups sugar.
• 6 tbsp sour cream.
• 2 tsp vanilla extract.
• 3 large egg whites.
• 1 1/4 cups all-purpose flour.
• 2 tsp baking powder.
• 1/4 tsp salt.
• 6 tbsp milk.
• 2 tbsp water.
• Pastry Cream: 2 egg yolks.
• 6 tbsp sugar.
• 1 1/2 tbsp cornstarch.
• 1 cup + 2 tbsp milk.
• 1 tbsp salted butter.
• 1 tsp vanilla extract.
• Chocolate Ganache: 12 oz semi-sweet chocolate chips.
• 2 tbsp light corn syrup.
• 3/4 cup + 2 tbsp heavy cream.