Homemade Apple Turnovers

APPLE TURNOVER INGREDIENTS:
►1 lb puff pastry (2 sheets)
►1 Tbsp all-purpose flour for dusting
►1 1/4 lb Granny Smith apples (3 medium)
►1 Tbsp unsalted butter
►1/4 cup brown sugar lightly packed
►1/2 tsp ground cinnamon
►1/8 tsp salt
►1 egg+ 1 Tbsp water for egg wash
FOR THE GLAZE:
►1/2 cup powdered sugar
►1-2 Tbsp heavy whipping cream