Preheat oven to 400 degrees. Line a cookie sheet with parchment paper and set aside.

Remove puff pastry from box and let sit on the counter for 10 minutes, until bendable. 

Cut puff pastry into 18 equal squares. There will be guidelines on the puff pastry you can follow.

Spread 1 teaspoon Nutella in the center of each puff pastry square. 

Arrange two slices of strawberry over each dollop of Nutella

Fold pastry in half diagonally (to form a triangle) and crimp edges with the tines of a fork. If the edges don't want to stick together, press a little bit of water into the pastry to make it adhere.

Transfer the turnovers to the lined cookie sheet. 

If using an egg wash, brush it on to the tops of the strawberry Nutella turnovers now.

Bake 12-13 minutes, until golden brown.

Let cool 10 minutes. 

Store any uneaten turnovers in an airtight container, up to 3 days.