Preheat oven to 375 degrees and line a baking sheet with parchment paper.
Lay 12 crescent rolls out on the parchment. Spread a thin layer of yams and top with a slice of ham. Place Brie on top of ham and finish with a small dollop of cranberry sauce. Wrap up crescent dough and brush with egg. Bake for 20 to 22 minutes until golden. Serve warm.