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. Use pastry cutter or fingers to blend until mixture resembles coarse crumbs.
04 - Press two-thirds of crumble mixture firmly into bottom of prepared pan to form even base layer.
05 - Combine cherries, sugar, cornstarch, lemon juice, and vanilla in separate bowl. Toss until cherries are evenly coated.
06 - Spread cherry filling evenly over pressed crust base.
07 - Sprinkle remaining crumble mixture over cherry layer in even layer.
08 - Bake for 38-42 minutes until top is golden brown and filling is bubbling around edges.
09 - Cool completely in pan before lifting out using parchment overhang. Cut into 16 bars.