Shortbread Crust:
1/2 cup (115g) unsalted butter, melted
1/4 cup (50g) granulated sugar
1 teaspoon vanilla extract
1/4 teaspoon salt
1 cup (125g) all-purpose flour

Apple Filling:
2 large apples, peeled and thinly sliced (1/4 inch thick)*
2 Tablespoons all-purpose flour
2 Tablespoons granulated sugar
1 teaspoon ground cinnamon
1/8 teaspoon ground nutmeg

Streusel:
1/2 cup (40g) old-fashioned oats
1/3 cup (70g) light or dark brown sugar
1/4 teaspoon ground cinnamon
1/4 cup (30g) all-purpose flour
1/4 cup (60g) unsalted butter, cold and cubed
homemade salted caramel sauce (step-by-step photos included)