My daughter, Dina (2.5 years old) calls these Rice Kiss-Me treats.
Rice Krispies website but I prefer to use a bit more marshmallows and butter. The standard bag of white marshmallows is about 300g, 10oz or about 40 marshmallows. Don't use the 'giant' ones. The fact that these exist at all is disturbing to me. For my friends in the Netherlands, do not use pink, green, or other colored marshmallows. Two problems exist with the non-white marshmallows: they will result in very unappetizingly-colored treats, and they have a strange artificial flavoring that reminds me of perfume. Just buy a bag of the plain white ones, not intermingled with other colors. Thanks. The 375g box of Rice Krispies will yield 2 batches of treats. Or one batch and a bunch of bowls of cereal.
Rice Kiss-Me Treats
1 bag of marshmallows (300g or 10oz)
5 cups of Rice Krispies (188 g)
6 Tbsp butter (86 g)
Grease your 9x13" (23x33cm) pan. Melt the butter in a large pot. Add the marshmallows and melt them, on low heat, stirring often. Once the marshmallows are melted, take the pan off the heat and add the Rice Krispies. Stir to combine and pour into the prepared dish. Pat with a spatula to make a compact structure. Allow to harden for a couple of hours and cut with a knife into squares. Keep covered because humidity will affect the texture.
If you are having a hard time finding marshmallows and Rice Krispies: "American Marshmellows" are found at Jumbo in Veldhoven and also often found at Xenos in Eindhoven. The Rice Krispies are at the AH XL and also at Jumbo. Don't use the jar of marshmallow fluff to substitute. Ugh. And if you are lactose intolerant you can substitute margarine for the butter with good results.