01 - Preheat the oven to 350°F. Line a 9x13-inch baking pan with parchment paper, leaving an overhang for easy removal.
02 - In a large bowl, mix together flour, oats, granulated sugar, brown sugar, baking powder, and salt.
03 - Add melted butter and vanilla extract to the dry ingredients. Stir until crumbly and evenly moistened.
04 - Reserve 1 ½ cups of the crumb mixture for the topping. Press the remaining mixture firmly into the bottom of the prepared pan to form the crust.
05 - In another bowl, toss cherries with sugar, cornstarch, lemon juice, and almond extract until evenly coated.
06 - Spread the cherry mixture evenly over the crust. Sprinkle the reserved crumble mixture evenly over the cherries.
07 - Bake for 35–40 minutes, or until the top is golden brown and the filling is bubbling.
08 - Cool completely in the pan, then lift out using the parchment overhang. Cut into bars and serve.