Armando Rafael for The New York Times. Food Stylist: Simon Andrews.

Classic cereal treats for the peanut butter fanatic, these marshmallow bars call for cornflakes instead of Rice Krispies, making for a wonderfully chewy-crunchy contrast. Cornflakes are delicate, so the key here is to avoid crushing the cereal too much when mixing the ingredients. The end result should be airy and chewy, but not dense, with visible chunks of marshmallow throughout. This recipe comes together quickly, so have your ingredients measured and ready to add to the pot when you begin. Once the chocolate topping has set, these bars pack well for picnics or potlucks, but if you’re concerned about the chocolate melting, you can skip it altogether and finish the bars with a sprinkle of sea salt.

1 to 1½ hours, plus chilling and resting 

20 minutes, plus at least 3 hours’ marinating

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