Pre-heat your oven to 300 degrees. Line an 8-inch square pan with parchment paper. Mix together the flour, salt, and sugar. Add the melted butter and the vanilla. Mix well until your dough forms, then press it into your lined baking pan. Once you’ve pressed the dough into an even layer, bake it at 300 degrees for 15 minutes. Allow the crust to cool for 15-20 minutes while you make the apples.

While the crust is cooling, increase the oven temperature to 350 degrees. Cut the apples into slices that are roughly 1/4-inch thick then add them to a bowl. Add the arrowroot, sugar, spices, and lemon juice to the bowl. Toss the apples so they’re evenly coated in the spices, sugar, and arrowroot. Arrange the apples in an even layer over the crust. Place the pan back in the oven and bake at 350 degrees for 30-35 min or until you can see that the edge of the crust is golden and the apples have softened. Allow the bars to cool to room temperature.

Melt together the vegan butter and 10 large vegan marshmallow over medium low. Stir regularly to encourage the marshmallows to break down and melt. Once they’re completely melted (this will take about 15 minutes), stir in the brown sugar. Continue to stir, allowing the brown sugar to melt and incorporate fully. This will only take 2 or so minutes. Immediately remove the caramel from the heat and drizzle it over the bars. Allow the caramel to cool to room temperature before slicing and serving the bars.