How to add sourdough discard to your recipe

To incorporate sourdough discard into your coffee cake recipe, simply mix in about a cup of the fermented flour mixture with your wet ingredients when preparing the batter. Begin by creaming together butter and sugar, then add in your eggs, vanilla, and sourdough discard. Combine this mixture with your dry ingredients, which should include flour, leavening agents, salt, and any additional spices. Next, pour the batter into a baking pan, generously sprinkle with crumb topping, and bake until it is perfectly set and aromatic.
If you're adapting a coffee cake recipe that wasn't originally intended for sourdough discard, there's no need to worry; you can easily modify the recipe to accommodate it. Since the discard consists of equal parts flour and water, you can reduce the amounts of flour and water in your recipe by the same quantities found in your sourdough discard. Keep in mind, however, that because the discard has been taken from the starter and is no longer being fed, it won't create carbon dioxide bubbles. Therefore, it won't contribute to the rise of your coffee cake during baking, so it's essential to retain the leavening agents like baking soda and baking powder in your recipe to ensure the cake rises and achieves a light, open crumb structure. It will, of course, add its distinctive sour flavor!
Tips for keeping your starter discard fresh

To gather discard for all your coffee cake baking needs (not to mention its fantastic application in various pizza dough, cracker, and pie crust recipes), you can easily store it in a jar in the refrigerator. When you feed your sourdough starter, simply take out the discard portion and keep it in a covered container in the fridge, adding and mixing in more discard as you collect it throughout the week.
Since the flour and water mixture will continue to ferment, it's crucial to keep it at refrigerated temperatures to prevent it from developing an overly strong flavor. If you believe you won't use your discard within a week or two, you can also freeze it. When you're ready to bake your coffee cake, thaw the discard completely in the fridge beforehand (just avoid heating it, as this will damage the cultures). Once the discard is mixed into your coffee cake batter and baked, you'll end up with a delightful breakfast or dessert that has a subtle yeasty tang — all thanks to the repurposed byproduct of your bread-making.
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