Preheat oven to 350ºF and then line a baking sheet with parchment paper and a little flour. In a small bowl, whisk the egg for your egg wash. 1 by 1 make the empanadas by scooping 2 Tbsp. of beef mixture just off the center of each dough round. Moisten the edges with egg wash and then fold over. Press ends together with a fork to seal. Make two small slits on the top of each to vent, then place on baking sheet and continue to make the rest of them.
Brush tops with egg wash and bake for 25 minutes until golden brown and crispy.