METHOD
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prepare the baking dish
Line a 20 cm x 10 cm (8-inch x 4-inch) deep baking dish with parchment paper with a few inches (or centimeters) of overhang off the sides.
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make the chocolate rice mixture
Add chocolate to a small bowl and microwave in intervals until melted or place in a heat-proof bowl and melt over a pot of simmering water. When the chocolate melts, stir to combine, add the puffed rice and mix using a spatula to combine everything together. Optionally add a pinch of salt. Using a spoon, spread the mixture evenly over the prepared baking dish, then press toward the bottom of the pan.
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chill and serve
Place the baking dish with the chocolate crunch bar mixture into a fridge. Leave to chill for an hour or overnight. Remove from the refrigerator, and cut into rectangles or 2 cm (1-inch) thick slices.