Preheat your oven to 375°F.
Using a rolling pin, on a floured surface, roll one of the dough balls out until it's about ⅛" thick. Keep the other dough in the fridge.
Cut circles in the dough using your cookie cutter (or a cup or some other round implement.) Put these on a plate or baking sheet and put them in the fridge.
With the scraps of the dough, roll it back up, roll it out, and cut more circles. Repeat until you're out of dough.
Put your dough circles in the fridge and repeat the process on the other dough ball, aiming to make an equal number of circles. Why divide it in the first place? This way, more of your dough stays cooler at a time.
Let your discs chill in the fridge for 15 minutes or so. In the meantime, mix together the egg and milk to make an egg wash.
Assemble the pies by taking one dough disc and spooning a tablespoon of filling onto the center.
Brush the egg wash around the outer edge of the dough disc. Then, press a second dough disc over the filling and press/pinch/crimp the edges all the way around to seal it.
Brush the tops of your pies with egg wash, and sprinkle with cinnamon.
Using your knife, cut two slits in the top, so steam can escape.
Bake for 18 minutes, or until the top is slightly browned and the bottoms are no longer moist.
Let cool for 5 or so minutes, and move to a cooling rack when you can. Eat as-is, or serve with ice cream and enjoy!