would take too long to cook and the dough would probably be overcooked or burn. you could cut the apple into eighths then roll the dough like a crescent roll over it, similar to the recipe on here for peach dumplings. the recipes for granny smiths in a blanket and apple pies inside and apple use refrigerated pie dough instead, it can hold up better to the longer cooking times that you need to soften the apples. 