Sourdough Mug Cake

I baked a lot of bread in December and had leftover sourdough starter a few times. This cannot be disposed of down the drain, and instead of throwing it into the bin I decided to make use of it. That is how this sourdough mug cake recipe came about. Make sure your starter is not too acidic otherwise your cake will not taste as sweet as you would expect it to.

Sourdough Mug Cake
Sourdough Mug Cake
Head straight on to the Recipe For ♥ Sourdough Mug Cake ♥
Feeding your starter

If you use your sourdough starter a lot, it would require constant feeding. In order to refresh your starter, you remove a portion of the starter, and this is referred to as discard. In my case, I do things a little bit differently as I hibernate my starter for weeks or even months at a time. When I need an active sourdough starter, I remove 2 tablespoons of starter, and place it into a jar. I then feed both the discard and the starter with 2 tablespoons of bread flour and 2 tablespoons of water. I whisk everything together and then let nature do its thing. I leave my starter on the counter in the sun for an hour, with the lid off, before placing it back in the fridge. And I leave the jar in the sun to feed until active.

Is my starter active, and other things to make with it

To check if your starter is active, drop a small amount into a glass of water. If the starter sinks, it needs more time. If it floats, it is ready to use. There are so many recipes on this blog, and on others, with suggestions on how to use your sourdough starter. Bread is the most obvious choice, but there are crackers, and cakes, muffins and pastry, croissants and cookies and so much more. Just use the term sourdough in the search bar to see what I have made. Many recipes call for you to activate your starter, and then weigh out a portion of it. The leftovers are also basically discard. And this is what I have used to make my sourdough mug cake.

Why bake a mug cake?
We all crave sweet things from time to time. And when that happens to be a need for cake, a mug cake is the ideal solution. There is no need to whip out your stand mixer, gather ingredients and get the oven going. And washing up is a breeze! All you need is one mug, a few ingredients, and a microwave. Mine is a 900W microwave, and this affects the cooking time. Also, I like mine moist, and would rather have it underbaked, than dry.
Take a look at this inspiring recipe for ♥ Sourdough Mug Cake ♥ from Lavender and Lime #LavenderAndLime Share on X

Sourdough Mug Cake


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5 from 2 votes

Sourdough Mug Cake

This is a great way to use up your discard, or left over starter
Recipe Category: Dessert
Makes enough for: 1 person
All Rights Reserved: An original recipe from Lavender and Lime


  • 25 g flour
  • 25 g xylitol
  • 10 g cocoa powder
  • 3 g baking powder
  • 1 pinch fine salt
  • 40 g sourdough discard / starter
  • 35 g milk
  • 25 g jam (I used sour cherry)
  • 20 g canola oil


  • Place the flour, xylitol, cocoa powder, baking powder and salt into a mug and shisk to combine
  • Add the sourdough, milk, jam and oil and whisk until completely combined
  • Place into a microwave and microwave on 900W power for 90 seconds
  • Remove from the microwave and leave to stand for 30 seconds before enjoying
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17 thoughts on “Sourdough Mug Cake

  1. Since I rarely eat cake and have not had a sourdough starter for years I should naturally and gracefully stay quiet! BUT, I quite like the sense and sensibility of cup cakes and yours looks very inviting indeed! Now have to think who might have a starter here and borrow ‘a bit’ !!!

  2. I love mug cakes but never thought to make one with starter. My starter is not always in best of shape, depending on how busy I am but if I make breads with it when it is a bit sharp I sometimes just add a bit of honey to balance the flavours. I could probably do this here too as I am very keen to try it.

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