For the cupcakes:
1 3/4 cups cake flour
1 cups sugar
1/2 tbsn. baking powder
1/4 tsp. salt
1/2 cup or 1 stick unsalted butter, diced, at room temperature
1/2 cup milk, divided
2 large eggs
1 large egg white
1 tsp. vanilla

For the filling:
3 tbsn. sugar
3 tbsn. light brown sugar
1 1/2 tsp. cinnamon
1 tsp. cocoa powder

For the frosting:
1 (8 oz.) package of cream cheese, softened
1/2 stick or 1/4 cup unsalted butter, softened
1 lb. powdered sugar
1 tsp. vanilla extract
vanilla bean seeds, from 1/2 a vanilla bean