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A new seasonal launch from the luxury high-street store, the Gimme S'more Brownie can be grilled (on a BBQ or indoor grill), or simply put in the oven.
It's ready in just eight minutes, and after being heated up you can expect a gooey, chocolatey, mashmallowey delight.
According to M&S, the treat is essentially a brownie, "made up of 'oh so good' biscuit, chocolate AND marshmallows". They promise it's "the ultimate in ooey, gooey chocolate indulgence".
If you want to get your hands on one, they're available in M&S stores now for a very reasonable £4.50.
Plus, they're even included in the 3 for £10 promotional offer across the chain's BBQ range, so you can stock up on other goodies while you're there (or just buy three brownies for yourself!).
Natalie Tate, Product Developer for the Gimme S'more Brownie said: "This first to market innovation is the ultimate indulgent treat for your barbeques this summer - because let's be honest, it is not just about burgers and bangers.
"Super quick and easy to heat - this crowd-pleasing Gimme S'more Brownie is impossible to say no to."
While you're in M&S, why not stock up on some Colin the Caterpillar Button Biscuits, too?
They're basically delicious chocolate biccies filled with a smooth and sweet white chocolate centre and topped with milk chocolate and sugar coated chocolate sprinkles. All the flavours we love about their iconic Colin cake, but in biscuit form!
The more-ish snacks are now available in stores, and you can grab a pack of five for just £1. They're perfect for a picnic in the park if you ask us, or you can scoff the bag to yourself - who's judging?!
"You've met our iconic Colin cake, gummy sweets, and even our share bags of chocolate Colin faces... NOW it's time to meet our BRAND NEW Colin the Caterpillar Button Biscuits," said M&S.
"Perfect for lunchboxes, picnic hampers...or handbags."
The store has been treating us to heaps of Colin goodies recently. Just this week, shoppers rejoiced when the supermarket giant released Colin the Caterpillar cake jars.
Alongside two other delicious flavours - fruity raspberry ripple and lavish trillionaire's - the Colin cake jar is described as being filled with "layers of all the Colin goodness", which is basically a rich chocolate sponge, Belgian chocolate sauce, chocolate ganache, milk and white chocolate chips and and a Colin the Caterpillar white chocolate face.
The jars cost £4 each, and are available in stores now. Sounds utterly unreal!
We think we're going to be leaving with a full trolley of sweet treats...
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