Whisk together the flour, salt, baking powder, and cinnamon. Add the butter and cream cheese, working it in to make a coarse/crumbly mixture, leaving most of the butter and cream cheese in large, pea-sized pieces.
Turn the dough out onto a floured work surface, and bring it together with a few quick kneads.
Pat the dough into a rough 10" log, flour the top lightly, then roll it into an 10" x 10" rectangle. Dust both sides of the dough with flour, then fold it in three like a letter.
Flip the dough over, sprinkle lightly with flour, then roll it again into an 8" x 10" rectangle. Fold it in three again. Wrap the dough, and chill for at least 1 hour before using.
Once the dough is ready:
Preheat oven to 375 degrees (F).
Roll the dough out into a 16" x 16" square; it should be about 1/4 inch thick. Using a small round cutter (I used a 2 1/2 inch wide biscuit cutter), cut out as many rounds as possible, making sure you keep an even number.
Place about 1/2 teaspoon of nutella and a 1/2 teaspoon of cream cheese on half of the cut-outs, leaving about 1/4 inch boarder so there's no leaking while they bake.
Place a lollipop stick in the center of each filled shape, making sure the top of the stick is secure and not poking through the dough.
Using a pastry brush wet the edges of each filled pie crust with a small amount of the egg wash. Then repeat the process with the unfilled cut-outs, just lightly coating the edges with egg wash before gently pressing it on top a filled one. Use a fork to crimp the edges. Repeat until all the dough shapes have been filled and sealed.
Place the pie pops on a large baking sheet, then add a light coating of egg wash to each pie before sprinkling with sugar. With a small sharp knife make a tiny x on each pie.
Bake for 15-18 minutes, until the pies are light golden. Cool for about 5 minutes on the baking sheet, then transfer to a cooling rack to cool completely. Once cool, store in an airtight container or package in individual cellophane bags.
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