Preheat oven to 350°F (175°C). Line a muffin tin with cupcake liners.
In a medium bowl, mix flour, sugar, baking soda, and baking powder.
Add butter, egg whites, vanilla, sour cream, and milk to the dry ingredients and mix until smooth.
Fill cupcake liners 3/4 full and bake for 20 minutes or until a toothpick inserted into the center comes out clean.
For the filling, heat milk and vanilla in a saucepan until it starts to steam. In a separate bowl, whisk egg yolks with sugar and flour. Gradually add the hot milk to the egg mixture, whisking constantly. Pour the mixture back into the saucepan and heat until it thickens. Let it cool.
For the ganache, heat the heavy cream in a saucepan until it starts to steam. Remove from heat and add the chocolate chips, stirring until smooth.
Once cupcakes are cool, cut a small hole in the top of each cupcake and fill with the custard filling. Top each cupcake with chocolate ganache.
Prep Time: 30 minutes | Cooking Time: 20 minutes | Total Time: 50 minutes
Kcal: 330 kcal | Servings: 12 cupcakes
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