01 - Preheat oven to 350°F. Line a 9x9-inch baking pan with parchment paper, allowing overhang for easy removal.
02 - In a large bowl, whisk together flour, sugar, baking powder, salt, and cinnamon until well combined.
03 - Add cold butter and egg to the dry mixture. Use a pastry cutter or fingers to blend until mixture resembles coarse crumbs.
04 - Press two-thirds of the crumble mixture firmly into the bottom of the prepared pan to create an even base.
05 - Combine cherries, sugar, cornstarch, lemon juice, and vanilla extract in a bowl. Toss until cherries are evenly coated.
06 - Spread the cherry filling evenly over the pressed crust.
07 - Sprinkle the remaining crumble mixture over the cherry layer.
08 - Bake for 38 to 42 minutes, or until top is golden brown and filling is bubbling.
09 - Cool completely in the pan before lifting out using parchment overhang and cutting into bars.