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