• Prepare cupcakes as per cake mix instructions (I usually make them a bit bigger so I only get 20 instead of 24)
• Allow to cool.
• Meanwhile peel and small dice apples.
• Melt 1/4 cup butter with brown sugar in a frying pan over medium heat. Add apples and cook for 8 to 10 minutes until sauce thickens and apples slightly tender. Remove from heat and allow to cool.
• Using an apple corer or paring knife, scoop out the centre of the cupcake about 2/3 the way down. Reserve the removed cake.
• Fill with a heaping teaspoon of apple filling and top with the reserved cake, tapping down if necessary.

Frosting

• Add the remaining 1 cup of butter and 4 cups confectioners sugar and 1/2 cup of milk to the bowl of electric mixer. Beat on high for 4 to 5 minutes.
• Split vanilla bean and scrap out the seeds. Add the seeds to the frosting and beat to combine.
• Add remaining confectioners sugar 1 cup at a time and beating 2 minutes after each addition until desired consistency is achieved.
• Frost cupcakes and sprinkle with cinnamon and sugar.