01 - Preheat oven to 350°F. Line a 9x9-inch baking pan with parchment paper, allowing overhang on sides 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 flour mixture. Use a pastry cutter or your fingers to blend until mixture resembles coarse crumbs.
04 - Press two-thirds of crumble mixture firmly and evenly into bottom of prepared pan to create a solid crust layer.
05 - In a separate bowl, combine cherries, sugar, cornstarch, lemon juice, and vanilla. Toss until cherries are evenly coated.
06 - Spread cherry filling evenly over the pressed crust base.
07 - Sprinkle remaining crumble mixture over cherry layer, covering filling completely.
08 - Bake for 38-42 minutes until top is golden brown and filling is bubbly around edges.
09 - Cool completely in pan before lifting out using parchment overhang. Cut into 16 bars.