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