Preheat oven to 425 degrees F. Line two baking sheets with parchment paper.
In a sauce pan, combine blueberries, pineapple, sugar, cinnamon, nutmeg, salt and butter. Cook over medium low heat until berries soften (5 minutes). Stir in flour and cook until thickened (about 2 minutes). Remove from heat and set aside to cool.
Lightly flour a work surface. Unroll pie crusts. Using a 4 inch round biscuit or cookie cutter stamp out 7 circles from each crust.
Using a cookie scoop or spoon drop 1 tablespoon of cooled filling onto the center of each pie crust circle. Don't overfill or they will break open during baking.
Lightly wet the outside edge of 1/2 pie crust circle. Fold in half. Fold and pinch edge to close. You can use a fork to do this but I liked the rustic look of the fold.
Mix egg (or egg white) with a small amount of water. Whip with a fork until foamy. Brush the top of each hand pie with egg mixture. Prick with a knife or fork to vent.
Place on the parchment paper lined baking sheet and bake 15 to 20 minutes or until golden brown. Allow to cool completely on the baking sheet.
Mix powdered sugar and a small amount of the reserved pineapple juice together to form a glaze. Drizzle over cooled hand pies. Allow to set briefly.
This recipe was calculated using the exact brands and measurements I used to make this recipe. If you are following a strict diet please note changing anything will cause the nutritional info to change. My calculations are intended as a guide only.