Boston Cream Pie Cupcakes

Ingredients

• 1/2 stick (57 grams) butter, melted
• 1 cup granulated sugar
• 1 egg
• 3/4 tsp. baking soda
• 1 tsp. vanilla extract
• 1 cup all-purpose flour
• 1/3 cup milk
• 1 cup milk
• 1/4 cup granulated sugar
• 3 egg yolks
• 1 tbsp. cornstarch
• 1 tbsp. all-purpose flour
• 1 tbsp. butter
• 3 1/2 bars (350 grams) dark chocolate
• 1 cup heavy cream