In a large bowl, bring together flour, baking powder, nutmeg, salt, brown sugar, and whisk together.
Add the cubed butter or margarine, to the dry ingredients and work the butter/Margarine into the flour with your hands until it becomes crumbly.
Add the Egg and mix it into the flour until it is well incorporated, then, begin to introduce the cold water a little at a time and use your hand to toss the flour into the Water until it's fully absorbed. Once the dough is formed, cover it up with a plastic wrap and put it in the fridge for at least 20 minutes.
After 20 minutes, take the dough out from the fridge, and roll it out on a lightly floured work surface. Then use the medium size pie cutter to cut out your circles. If you happen to not have a pie cutter, you can use any circular object around the house to cut out your dough.
Place the cut-out dough on your pie cutter. Fill it with about 2 tablespoons of filling brush the circular edge of the pie with the Egg wash and close it up with the pie cutter (Seal the pie). See note
Remove the pie from the pie cutter and place it on a parchment lined baking sheet. Brush the surface of the pie with the Egg wash and use a fork to poke a few holes on the surface of the pie. See note
Place the pies in a 350°F preheated oven and bake for 25 to 30 minutes till the surface of the pie becomes golden.
It is best served while still hot Serve as breakfast with a Cup of Tea, for brunch or evening snack with a chilled drink.