Slow Cooker Marshmallow Brownies

Slow Cooker Marshmallow Brownies

Rich, gooey and indulgent, Slow Cooker Marshmallow Brownies are just the best!

The marshmallows melt into the centre of the brownies, making them even more gooey and sticky, then you melt some more marshmallowy on top for a chewy layer to bite through.

Brownies are the perfect bake to make in a slow cooker, they are fudgy and dense and of course you can forget about them for a couple of hours.

Slow cooker marshmallow brownies

Line your slow cooker with parchment/baking paper, and add a cloth/tea towel under the lid to catch drips and moisture, and your slow cooker is ready for baking.

I bake a lot in my slow cooker, in case you hadn’t noticed, there are loads more slow cooker baking ideas and recipes here and in my slow cooker archives.

Slow cooker marshmallow brownies

Slow cooker marshmallow brownies taste great and are so easy to bake.

These are perfect for baking with kids too. Mine really love slow cooker baking and there is much less risk of them burning themselves.

Slow cooker marshmallow brownies

Cut yourself a square and enjoy with a coffee. Share with your friends and work colleagues and you’ll be popular!

Slow cooker marshmallow brownies

They would be great for a school or workplace bake sale too.

Slow cooker marshmallow brownies

Pin slow cooker marshmallow brownies for later!!

Slow cooker marshmallow brownies - a rich and indulgent bake in your crockpot!

Slow cooker marshmallow brownies

Slow Cooker Marshmallow Brownies

Bake delicious chewy marshmallow brownies in your slow cooker
5 from 1 vote
Print Pin Rate
Course: Dessert
Cuisine: British
Prep Time: 15 minutes
Cook Time: 2 hours
Total Time: 2 hours 15 minutes
Servings: 10
Calories: 283kcal


  • 125 g butter
  • 125 g dark chocolate broken into small pieces
  • 2 medium eggs
  • 150 g caster sugar
  • 20 g cocoa powder
  • 60 g plain flour
  • 10 large marshmallows cut in half


  • Chop the butter and chocolate up into small pieces and put in a bowl. Microwave on high for 1-2 minutes until melted. Allow to cool.
  • Whisk the caster sugar and eggs together for 3-5 minutes using an electric mixer, until it looks thick and creamy.
  • Pour the cooled chocolate and butter mixture over the egg and sugar mixture and fold it in gently until completely mixed.
  • Sieve in the cocoa powder and flour and again fold in gently until completely incorporated, but do not overmix.
  • Grease and line your slow cooker bowl with grease proof paper.
  • Pour the brownie batter in.
  • Add about 6 of the marshmallows, in pieces, on top.
  • Cook on high for 1.5 to 2 hours or until just set in the centre. See my note below regarding cooking time. 
  • Half way through, add the rest of the marshmallows on top (the others will have sunk/melted into the brownies).
  • Allow to cool completely before using the baking paper to remove from the slow cooker.


Note: Timings need to be adapted for your own slow cooker.
If your dishes often cook quickly, check the brownies after an hour. Watch out for burning.
If your slow cooker cooks slowly like mine, you might need to extend the time. Mine took 3 hours in a very slow slow cooker!
Tried this recipe?Tag me @bakingqueen74 or use hashtag #bakingqueen74!


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My slow cooker burns the outside before the middle is cooked if I use grease proof paper so I got come silicon cake tins and silicon cupcake molds (put paper cupcake cases inside these) now there’s no burning just yummy cakes and brownies.

Thanks for sharing the recipes. 🙂

Jessica Grabaskey

Hi, may sound a really silly question but never tried anything like this before… Do I put the lid on the slow cooker or not?


I made these tonight but they didn’t turn out so great!followed the recipe, greased and lined the slow cooker pot, cooked on high until middle just set but the sides and bottom ended up burnt and stuck to the greaseproof paper!Any ideas where I went wrong or did I just cook it for too long?Feel if id taken it out sooner to prevent sides burning it wouldn’t have been cooked properly in the middle!!I got stuck into the middle of it with a fork to try it and its so good, lovely and moist and gooey its such a pitty… Read more »

Well these sound a bit epic. I may try making my own fave brownie recipe in the sc. Never thought of doing that before.x