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