01 - 
                Preheat the oven to 190°C and line a 23x33 cm baking pan with parchment paper.
              
              
              
                02 - 
                In a large mixing bowl, whisk together the melted butter, granulated sugar, vanilla extract, and salt until well blended.
              
              
              
                03 - 
                Incorporate the flour into the butter mixture until crumbly. Reserve approximately two-thirds of the mixture, then evenly press it into the bottom of the prepared pan to form the crust layer.
              
              
              
                04 - 
                Toss the sliced apples with ground cinnamon and ground nutmeg in a separate bowl until evenly coated.
              
              
              
                05 - 
                Spread the spiced apple slices uniformly over the crust. Drizzle the salted caramel sauce over the apples.
              
              
              
                06 - 
                Crumble the reserved flour mixture evenly over the apple and caramel layers to create the topping.
              
              
              
                07 - 
                Bake in the preheated oven for 40 to 45 minutes, or until the topping turns golden brown and the apples are tender.
              
              
              
                08 - 
                Allow the bars to cool completely in the pan before slicing into 16 portions.