01 -
Preheat the oven to 175°C. Line a 20x20 cm baking pan with parchment paper, allowing an overhang for easy removal.
02 -
In a mixing bowl, combine rolled oats, flour, light brown sugar, and fine sea salt. Stir in the melted butter and vanilla extract until the mixture forms coarse crumbs.
03 -
Press the oat mixture evenly into the prepared pan. Bake for 15 to 17 minutes, or until lightly golden. Let cool for 10 minutes.
04 -
In a separate bowl, blend pistachio butter, powdered sugar, softened butter, vanilla extract, and a pinch of salt until smooth and creamy.
05 -
Evenly spread the pistachio butter filling over the cooled oat biscuit base.
06 -
Scatter the mini marshmallows evenly over the pistachio butter layer.
07 -
Using a kitchen torch, toast the marshmallows until golden and lightly charred. Alternatively, place under a broiler for 1–2 minutes, watching carefully.
08 -
Allow the assembled bars to cool completely. Once set, slice into portions and serve.