Preheat oven to 375.

Line baking sheet with parchment paper and set aside.

Unwrap pastry dough and unfold onto a different floured sheet of parchment paper.

Use a rolling pin to gently smooth out the creases in the dough.

Cut pastry dough using a 4 inch round cookie cutter or cut each pastry sheet into square quarters.

In a small bowl, lightly beat together egg and water to create an egg wash and brush along the edges of the cut pastry dough.

Pop the Nutella in the microwave for 15 seconds to make it easier to spread, then spread about 1 tbsp of Nutella in the middle of each pastry, leaving about an inch wide border. I find using the back of a spoon and working in a circular motion works best.

Slice strawberries into thin slices, arranging one strawberry on the Nutella of each tart.

Lightly sprinkle tarts with granulated sugar.

Bake for 12-14 minutes until edges of tarts are golden brown.

Remove from oven and transfer the parchment paper and pastries to a wire rack to cool for 5-10 minutes.

Dust with confectioners' sugar and enjoy warm.