Making Cranberry Crumble Bars is a straightforward process. Here’s how to do it step by step:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease and line a 9×9-inch baking pan with parchment paper for easy removal.

2. Prepare the Crust: In a large bowl, combine the flour, 1 cup of sugar, and salt. Stir in the melted butter until the mixture resembles wet sand.

3. Set Aside Some Mixture: Reserve about 1 cup of this mixture for the crumble topping. Set it aside.

4. Press the Base: Press the remaining mixture firmly into the bottom of the prepared baking pan to form a crust.

5. Prepare the Filling: In another bowl, combine the halved cranberries, ½ cup of sugar, lemon juice, vanilla extract, and optional cinnamon. Mix until well combined.

6. Spread the Filling: Evenly distribute the cranberry mixture over the crust in the pan.

7. Make the Crumble Topping: To the reserved crumble mixture, stir in the rolled oats until combined. Sprinkle this mixture evenly over the cranberry layer.

8. Bake: Place the pan in the preheated oven and bake for 30-35 minutes or until the top is golden brown and bubbly.

9. Cool: Remove from the oven and let the bars cool in the pan for 10-15 minutes. Use the parchment paper to lift the bars out of the pan and allow them to cool completely on a wire rack.

10. Slice and Serve: Once cooled, slice into squares and serve. Enjoy your amazing Cranberry Crumble Bars!