Start by preheating the oven to 400 degrees F.
In a bowl, beat the egg and water to prepare the egg wash.
Over parchment paper or a floured surface, use a rolling pin to roll the pie crust dough out to about a 1/4 of an inch thick.
Use an index card if you have one to cut out 3×5 rectangles out of the dough. Roll the dough out again and repeat the same steps until you’ve used up all of the dough.
Brush the edges of the pie crust dough with egg wash.
Place about 1 – 1 1/2 tbsp of Nutella on half of the dough rectangle shapes. Use the rest of the dough rectangles to close the pop tarts.
Seal the edges of the pop tarts with a fork and poke a few holes on top.
Brush each pastry with egg wash and transfer to a parchment paper lined baking sheet.
Bake for 400 degrees F for 12-15 minutes or until golden.
Remove from the oven once finished and allow them to cool down.
Prepare the icing by mixing the heavy cream and powdered sugar in a bowl.
Dip the mini chocolate chips in icing before placing them on the marshmallow to make the eyes. Allow the icing some time to dry completely so it sticks to the marshmallow. You may lie the marshmallows down if the chocolate chips are sliding off while you wait for the icing to dry.
Insert the orange sprinkle into the center of the marshmallow under the eyes for the nose.
Top the pop tarts with white icing and immediately place the marshmallow on top.
Allow the icing a little bit of time to dry and enjoy these adorable Christmas pop tarts as soon as you can.