01 - Preheat oven to 350°F. Line a 9x9-inch baking pan with parchment paper, leaving overhang for easy removal.
02 - Whisk flour, sugar, baking powder, salt, and cinnamon in a large bowl. Add cold butter and egg. Blend with pastry cutter or fingers until mixture resembles coarse crumbs.
03 - Press two-thirds of crumble mixture firmly into bottom of prepared pan to form crust.
04 - Combine cherries, sugar, cornstarch, lemon juice, and vanilla extract. Toss until cherries are evenly coated.
05 - Spread cherry filling evenly over crust. Sprinkle remaining crumble mixture over cherry layer.
06 - Bake for 38-42 minutes until top is golden brown and filling is bubbling.
07 - Cool completely in pan before lifting out and cutting into 16 bars.