Line a 9″ x 9″ baking pan with parchment paper. Set aside.

Chop 4 single Kinder Bueno bars into large chunks. Optional: place in the freezer while you melt the chocolate.

Place a medium-sized, heatproof bowl over a pan of gently simmering water and melt the chocolates, being careful not to let the bowl touch the water. Once melted, remove from heat and stir in the peanut butter. Let cool for 5 minutes. You want the mixture to be easy to mix but not so warm that the Kinder Bueno pieces melt.

While the chocolate cools, roughly crush the graham crackers. Pieces should be small enough so you can mix them in with the other ingredients but not fine crumbs. You want to see chunks of crackers in the final product.

Stir the graham cracker pieces, golden raisins, and Kinder Bueno pieces into the cooled chocolate. Work quickly so the Kinder Bueno pieces don’t melt too much.

Pour the mixture into the prepared pan and level off. Cover and place in the refrigerator for 1 hour.

Once the tiffin is set, remove the tiffin from the baking tray and spread with the Nutella. Sprinkle with a little sea salt then decorate with the Kinder Bueno pieces, graham cracker crumbs, and white chocolate chips.

Cut into squares and serve.