1-Preheat your oven: Preheat your oven to 350°F (175°C) and grease a baking pan to prevent sticking; this step sets the stage for even baking and easy cleanup.

2-In a mixing bowl: In a mixing bowl, combine the flour, sugar, and salt, then cut in the softened butter until the mixture resembles coarse crumbs; think of it as creating the perfect base that holds everything together.

3-Press two-thirds: Press two-thirds of the crumb mixture evenly into the bottom of the prepared pan to form the crust; pat it down firmly for that sturdy layer we all crave.

4-Prepare the raspberry filling: Prepare the raspberry filling by mixing the frozen raspberries, granulated sugar, flour, cornstarch, and lemon juice in a separate bowl, then spread it evenly over the crust; give it a gentle stir to ensure it’s not too runny.

5-Sprinkle the remaining crumb mixture: Sprinkle the remaining crumb mixture evenly over the raspberries to create that signature crumble top; don’t pack it too tightly for extra crunch.

6-Bake in the preheated oven: Bake in the preheated oven for 35-40 minutes or until the top is golden brown; keep an eye on it so you pull it out at just the right time.

7-Let the bars cool completely: Let the bars cool completely before cutting into squares; patience here pays off for neat slices you can serve chilled or at room temperature.