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 sliced almonds until uniformly blended.
03 - Add cold cubed butter to the flour mixture. Using a pastry cutter or fingertips, work butter into dry ingredients until coarse crumbs form.
04 - Add the beaten egg to the crumb mixture and mix gently until just combined. Texture will remain crumbly.
05 - Press two-thirds of the crumble mixture firmly and evenly into the bottom of the prepared pan to create a solid crust layer.
06 - In a medium bowl, combine cherries, sugar, cornstarch, almond extract, and lemon juice. Toss thoroughly until cherries are evenly coated.
07 - Spread the cherry mixture evenly over the pressed crust, ensuring uniform coverage.
08 - Sprinkle remaining crumble mixture over the cherries, then distribute additional sliced almonds across the surface.
09 - Bake for 35-40 minutes until the topping turns golden brown and the cherry filling bubbles at the edges.
10 - Allow bars to cool completely in the pan. Using parchment overhang, lift out and cut into 16 equal squares.