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  • Serena Di Sabatino Di Diodoro

Sourdough cosmic brownies

Updated: Mar 8, 2022

Do you know that you can make amazing brownies with your sourdough discards??

I know!

Thanks to Izy Hossack I discovered this recipe and then I adapted it to make great cosmic brownies with a cereal twist.

If you don't know what I am talking about, cosmic brownies are chewy chocolate fudge brownies with chocolate frosting and topped with rainbow candy coated sprinkles.

Honestly, my crunchy and colourful homemade version was one of the best thing I've baked this year.

If you still have your sourdough starter after the quarantine you should definitely bake it too!! Check out the recipe below.


  • 48g dark chocolate

  • 15g butter

  • 20g vegetable oil

  • 1 medium egg

  • 42g granulated sugar

  • 32g brown sugar

  • 10ml water

  • 1/2 teaspoon vanilla extract*

  • 16g unsweetened cocoa powder

  • 38g sourdough starter (100% hydration) *

  • pinch of salt


  • 55g dark chocolate

  • 30ml milk

  • Sour Patch Kids Cereal crumbles*


  1. Preheat oven to 350°F (180°C). Line a 13cm square pan with parchment paper.

  2. Melt dark chocolate with oil and butter on a double boiler then remove from the heat and set aside.

  3. In a bowl add egg, sugar and salt and whisk with the electric beaters until pale and very fluffy.

  4. Pour water and vanilla extract and continue to whisk until the sugar has dissolved.

  5. Add cocoa powder and sourdough starter into the melted chocolate mixture and mix until completely combined.

  6. Add the chocolate mixture to the bowl of whipped egg mixture and fold together until just combined.

  7. Pour the batter into the prepared pan and bake for about 20 minutes or until the surface looks dry and a toothpick inserted into the centre of the brownies should come out with a little bit of batter still.

  8. Let the brownies cool in the pan for about 20 minutes.

  9. Melt dark chocolate with milk on a double boiler and mix until you get a pourable consistency.

  10. Pour the chocolate cream on the brownies and top them with Sour Patch Kids Cereal crumbles. Let it set for about 20 minutes and then slice it into 4 squares.

  11. Enjoy :)


  • My sourdough starter was 4 days old and kept in the fridge. You should wait for it to go back to room temperature before using it though.

  • You can use vanillina (powdered vanilla) if you can't find vanilla extract.


If you make it let me know! :)

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