Creating Salted Caramel Apple Crumble Bars requires some simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking pan.
2. Prepare the Crust: In a large bowl, combine flour, oats, brown sugar, granulated sugar, melted butter, cinnamon, and salt. Mix until crumbly.
3. Set Aside Crust Mixture: Reserve about 1 cup of the crumble mixture for topping. Press the remaining mixture firmly into the bottom of the prepared baking pan to form an even crust.
4. Prepare the Filling: In another bowl, mix the diced apples with lemon juice, and toss to coat.
5. Layer Apples: Spread the apple mixture evenly over the prepared crust.
6. Drizzle Caramel Sauce: Evenly drizzle salted caramel sauce over the apples, ensuring a good coverage.
7. Add Crumble Topping: Take the reserved crumble mixture and sprinkle it evenly over the caramel-covered apples.
8. Bake: Place the pan in the preheated oven and bake for 35-40 minutes, or until golden brown on top.
9. Cool: Remove from the oven and allow to cool in the pan for at least 15 minutes. For best results, cool completely before slicing into bars.
10. Slice and Serve: Cut into squares and serve. Enjoy the delightful layers of apple, caramel, and crumble!

These straightforward steps will help you create an amazing batch of Salted Caramel Apple Crumble Bars that will impress everyone who tries them.