Crust Preparation: Create a buttery crust using flour, sugar, and butter, pressing it firmly into a baking dish.
Cherry Filling: Combine fresh or canned cherry pie filling with a splash of lemon juice to enhance the flavor.
Layering: Spread the cherry filling evenly over the prepared crust, ensuring full coverage.
Crumb Topping: Make a crumbly topping using a mixture of flour, oats, sugar, and butter, then sprinkle it over the cherry filling.
Baking: Bake the bars until the topping is golden brown and the filling is bubbling, usually around 30-35 minutes.
Cooling and Serving: Let the bars cool completely before slicing into squares and serving.