Preheat the oven to 350°F. Line a jellyroll pan with parchment paper.
In a large mixing bowl, add the flour, baking powder, sugar, and salt; mix.
Add in the softened butter. Using a pastry cutter (or spoon), mix until the dough forms small beads.
Add in the vanilla extract, and egg. The dough should not be sticky.
Remove the dough from the bowl, and divide it into two halves. Transfer one half to the parchment-lined jelly roll pan. Press the dough into the bottom of the pan so there is an even layer.
Bake the pie crust dough layer for 15 minutes. The dough will be golden brown.
Using a rubber spatula, spread the cherry pie filling over the crust.
Crumble the remaining dough and sprinkle it over the cherry pie filling.
Bake for 35-40 minutes. The crumble topping will be a golden brown color. The cherry pie filling may be slightly darker.
Once done, allow the bars to cool for at least 20 minutes. You can optionally ice them if you please. Cut the bars once they are done.