Step 1

In a large bowl whisk together the flour, salt, baking powder, and sugar. Add the butter, working it in with your hands or a pastry cutter, until it's a coarse meal. The butter should still be in large, pea-sized pieces. Using a rubber spatula, stir in the sour cream. The dough will be very shaggy at this point. Turn it out onto a well floured work surface, and bring it together with a few quick kneads.

Step 2

Pat the dough into a 10 inch log, then roll it out into a 10" x 12" rectangle. Dust both sides of the dough lightly with flour, and starting with the shorter end, fold it in three - like a letter. Flip the dough over, and roll it again into a 10" x 12" rectangle. Fold it in three again. Wrap the dough in saran wrap, and chill for 1 hour.

Step 3

Combine all the ingredients in a saucepan over medium-high heat. Simmer, stirring almost constantly, until the mixture starts to thicken – about 6 minutes. Reduce heat to low and cook for another 2 minutes before removing from the heat. Transfer to a heatproof bowl and cool to room temperature.

Step 4

Preheat the oven to 425°F. Place a rack on the middle shelf. Line a large baking sheet with parchment paper, set aside until needed.

Step 5

Roll the dough into a large square that’s about 1/8 of an inch thick. With a straight edge and pastry wheel, cut out sixteen 3 inch squares. Place squares on prepared baking sheet. Using a small knife, make three tiny slashes across 8 of the squares. Fill the other 8 squares with two tablespoons of the cherry filling, then match up each one with a vented piece of dough.  Lightly brush the edges and tops of each pie and crimp the sides together using a small fork.

Step 6

Bake the pies for 20 to 22 minutes, or until golden brown. Remove from the oven, and cool for at least 10 minutes before serving.