I Heart Bread - Cinnamon Apple Custard Cupcake Bun

Few days ago, I bought some granny smith apple and planned to make either tarte tatin or apple pie. But since I usually bake after dinner, once I finish the dessert it will become a sugar overload late night supper. Since my family just finish the bread I made the other day, so I decide to put the apple in bread. The first thing come to my mind is to have cinnamon with my apple, due to some technical issue, I just though a custard would be good to combine with cinnamon apple to put into bun. (Just so it would mess up too badly when I fold it in.)