Rice Krispie Squares

I don't have kids and I don't work in a school so I never remember when half term is until I get in my car on a Monday morning and realize that all the traffic has just magically disappeared over the weekend, the journey to work takes about a quarter of the time it does the rest of the year and I'm not coming to blows with someone in the car park at work for the last parking space at 9.01 am.
Of course this does mean that for an awful lot of you, you are currently wandering around the house with a slightly glazed look of shock on your face, clutching your fourth cup of coffee to your breast at 7am as your little darlings tear up the joint going stir crazy, especially if the weather continues to be as bad as it was last week.   You've spent the weekend desperately trawling the 'What's On' pages of the local rag, calling your friends for day trip inspiration that will ideally wear Molly and Mikey out enough that they just want to watch a Disney film later on and you now have your eyes glued to the computer screen as you google 'things to do with your kids in half term'.
Well oh fraught one, I present you with 'Something To Do With Your Kids In Half Term'.
The fact that I make these on a regular base for my husband is neither here not there.
These are ridiculously simple and have that delightful stickiness about them that kids will love and will love smearing all over your carpet and the dog.  I'd keep an eye on them.  You will also be using the hob, heating butter and marshmallow so again, I would recommend only attempting under direct supervision.  Also keep an eye on the marshmallows.  If your kids are anything like my husband you will be lucky if you get to the part where you need them with enough left to actually cook with.
They take about 15 minutes in total but you can easily lengthen that out by getting the kids to do the weighing and measuring and patting down the krispie mix.   You could even ice and decorate them!
So gather your small ones close and go foraging for:
50g unsalted butter
200g marshmallows
180g Rice Krispies
Over a low heat, melt the butter in a large pan and add the marshmallows.  Stir until all the marshmallow is completely melted.   Pour in the rice krispies and stir to coat everything.  Quickly move to a greased baking tin, making sure it is packed down and even.  Set the tin aside to cool and set (about an hour).  Carve into squares and let the kids enjoy their treat!
I apologize for the sugar rush this *may trigger.
*almost certainly will.  Unless you use sugar free marshmallows.  Is there even such a thing and if it does exist, it begs the question, should it?