The Sourdough Discard Coffee Cake Worth Saving Your Jar For
This sourdough discard coffee cake began as a way to save flour. Years later, it still lands on our kitchen table every weekend. The discard gives it a soft tang and a moist crumb. Meanwhile, a ribbon of cinnamon sugar hides in the middle, waiting for the first slice. Best of all, it’s in the oven before coffee’s done.
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This recipe started in the spring of 2020, the week our whole city went quiet. Leo was a few months old. F had turned our kitchen table into an office, his laptop wedged between the baby bouncer and the fruit bowl. Grocery runs became small missions, planned days ahead and finished as fast as possible.
On one of those runs, I found the baking aisle stripped bare. The yeast shelf held only price tags. At the very bottom sat a single bag of all-purpose flour with a split corner. I grabbed it so fast that it left a white trail all the way to the checkout.
At home, I set the bag on the counter like a trophy. F looked at it, then at me, and asked what I planned to make with zero yeast. That night, I stirred flour and water into an old jam jar and snapped a rubber band around the glass.
For the next week, that jar was the first thing I checked every morning, before coffee and before the news. On day three, it bubbled past the rubber band, and I called F over to look. By day four, it had sunk flat and smelled like old gym socks. I almost poured it out. Instead, I kept feeding it, because it was the one thing I could grow inside our four walls.
On the ninth morning, the jar had doubled overnight. I let out a yell that woke Leo from his nap. F came running in with shaving cream on half his face.
Then came the problem every new baker meets. Feeding a starter means taking some out first, and that extra discard usually goes in the trash. That spring, throwing away flour felt almost criminal. The bag on the counter was shrinking, and every grocery run still felt like a gamble.
So on Sunday, I scraped the discard into a bowl with butter, brown sugar, and cinnamon. Then I hoped for the best.
The cake came out lopsided, with the cinnamon sugar slumped toward one corner. We carried it onto our tiny balcony anyway, the only outing we had that week. F poured the coffee. Leo slept against my chest in his carrier, collecting a few crumbs in his hair. Down on the street, people walked their dogs in wide circles around each other.
For one hour, it felt like an ordinary Sunday. After that, the coffee cake marked the end of every week. When the days blurred together, Sunday was the day with cake.
Six years later, the same sourdough starter lives in a jar in our fridge door. Leo named it Mr. Bubbles last winter. Now he feeds it every Saturday, weighing the flour on my kitchen scale with great ceremony. That spring lives only in photos for him, a sleepy baby on a balcony with cinnamon in his hair. Lin, who came along later, insists on sprinkling the filling. Most of it lands on the counter.
That jar is my Liquid Sourdough Starter, fed and fussed over since that first spring. On weekdays, it goes into our No-Knead Italian Rosemary Sourdough Bread, which disappears faster than I can slice it.
Every weekend, the coffee cake shares the table with a pot of F’s Colombian Cafe Tinto. It’s the same coffee he poured on that balcony. For family visits, I make Easy Tiramisu Cups the night before so a coffee dessert waits in the fridge.
This cake recipe sits right alongside the rest of my sourdough recipes, all fed by the same jar. Each one has its own job, and this sourdough cinnamon cake is how our week ends. The baby who slept through that first slice now reaches for the corner piece before anyone else.
Ingredients
For the crumble topping, grab unsalted butter, brown sugar, all-purpose flour, and ground cinnamon. The cinnamon filling uses that same trio of brown sugar, flour, and cinnamon, minus the butter.
For the batter, you’ll need softened butter, brown sugar, granulated sugar, eggs, and vanilla extract. Then grab sour cream, sourdough discard, milk or buttermilk, salt, baking powder, and more flour.
Sourdough discard is the heart of this cake. It’s the portion of starter you remove before each feeding. I collect mine in a jar in the fridge door all week. Its mild sourness cuts through the sugar and makes the cinnamon taste warmer. It also adds moisture, which keeps the cake soft for days.
Age changes the flavor. Discard that’s a day or two old tastes mild. Week-old discard has fermented longer and tastes more sour. Over time, a thin gray liquid may pool on top. The first time I saw it, I was sure I had killed the whole thing. It’s harmless alcohol, so stir it back in or pour it off. Pink or orange streaks mean the jar goes straight in the trash. Discard from a stiff starter also works, though it makes a thicker batter and a denser cake.
For the milk, whole milk keeps the flavor mellow, while buttermilk adds a sharper sourness. Greek yogurt can replace the sour cream, though the cake turns out a touch drier. I prefer baking powder here over baking soda, since it carries its own acid. For a gluten-free cake, use a cup-for-cup flour blend and discard from a rice flour starter. Chopped pecan pieces on top add a nice crunch.
See the recipe card for the full list and exact quantities.
Top Tips
Top Tips
Stir Your Discard Down Before Measuring– Bubbly discard fills a measuring cup with air, so you end up with less than you think. Stir it down first, or weigh it on a kitchen scale at about 60 grams. That keeps the ingredient amounts the same every time.
Start the Batter Overnight– Mix everything the night before for an easy weekend morning, but hold back the baking powder. Cover the bowl with plastic wrap and refrigerate. The overnight fermentation deepens the flavor while you sleep. In the morning, let the batter sit at room temperature for 30 minutes, then fold in the reserved powder.
Bake It as Muffins– Spoon the batter into a lined muffin tin with filling in the middle. Bake at 350°F and start checking at 20 minutes.
How to Make Sourdough Discard Coffee Cake
This crumb coffee cake comes together in about an hour. It has three simple parts: a topping, a filling, and a soft batter. The batter can look loose and a little curdled along the way, and that’s perfectly normal. Watch the top’s color more than the clock. Here’s how to make this sourdough coffee cake:
Get the Oven and Pan Ready
- Preheat the oven to 350°F and grease an 11×8-inch baking pan.
- I also line the pan with parchment paper, leaving extra paper hanging over the edges. Those flaps let you lift the whole cake out later for neat, even squares.
Make the Crumble Topping
- Make the topping first, so it has time to cool. Warm clumps sink into the batter, while cooled ones stay on top.
- A slightly clumpy texture is exactly what you want. Those lumps bake into crisp, buttery little bites.
Mix the Cinnamon Filling
- I whisk it quickly to break up any hard bits of sugar. The flour soaks up the melting sugar and keeps the filling in place as the cake bakes.
Cream the Butter, Sugars, and Eggs
- Room temperature butter is key here, and a gentle press with your finger should leave a dent.
- The mixture will look slightly grainy from the brown sugar.
Add the Wet and Dry Ingredients
- I like to use a spatula here, since discard tends to cling to the bowl in sticky streaks.
- Stop mixing once the last streak of flour disappears for a tender crumb. If your powder tends to clump, whisk it with the flour in another bowl first.
Layer the Batter and Filling
- An offset spatula makes spreading easier, though the back of a spoon works too.
- A few small lumps of flour are fine, since they melt into the cake as it bakes.
Add the Remaining Batter and Topping
- Dollops spread more easily than one big pour. Keep going until the filling disappears underneath.
- Break any large clumps into pea-sized pieces so they bake evenly.
Bake
- Slide the pan into the preheated oven and bake for 40 to 45 minutes, until golden brown.
- It’s ready when a toothpick in the center comes out clean or with a few moist crumbs. If the top darkens too fast, tent the pan loosely with foil for the last 10 minutes.
Serve
- Cut the cake into 12 to 16 squares and serve it slightly warm or at room temperature.
- For neat squares, let it cool completely, then lift it out by the parchment.
Storage
To store the cake, cover the cake pan tightly or move the slices to an airtight container. It keeps at room temperature for up to three days, and the discard keeps it soft. If your kitchen runs warm, refrigerate it for up to five days. Let slices sit out for 20 minutes before serving.
For longer storage, wrap individual squares in plastic wrap and freeze them for up to three months. Thaw them on the counter or overnight in the fridge. To reheat, microwave a slice for 15 seconds. A few minutes in a low oven crisps the topping again. If you bake the cake a day ahead for guests, it slices even more cleanly the next morning.
FAQs
Most often, the batter got mixed too long after the flour went in. Underbaking is the other common cause. Stop mixing once the flour disappears, and bake until a skewer comes out with only a few crumbs. Expired baking powder or extra discard can also weigh the cake down, so check the date first.
Yes, as long as it passes a quick check. Pink or orange streaks or fuzzy spots mean it’s time to toss it. A sharp, sour smell is normal at that age. The cake will taste much more sour, though. For a milder result, mix it half-and-half with fresher discard.
Lay a loose sheet of foil over the pan, then keep baking until a skewer comes out with a few crumbs. Move the rack to the middle of the oven if it sits higher. Dark metal or glass pans brown faster, so next time, lower the heat by 25°F. An oven thermometer also helps, since many ovens run hot.
Usually, the topping goes on while it’s still warm. Melted butter makes heavy, wet clumps that settle into soft batter. Let the streusel cool until it holds its shape, then scatter it lightly over the surface. A batter thinned with extra milk or discard can also sink.
Recipe
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Sourdough Discard Coffee Cake
This soft coffee cake made with sourdough discard hides a layer of cinnamon sugar under a buttery crumb topping. The batter mixes up in minutes.
Ingredients
Crumble topping
- 4 tablespoons unsalted butter melted
- ½ cup brown sugar
- ½ cup all-purpose flour
- 2 teaspoons ground cinnamon
Cinnamon filling
- ⅓ cup brown sugar
- ⅓ cup all-purpose flour
- 2 teaspoons ground cinnamon
Batter
- ½ cup unsalted butter softened
- ½ cup brown sugar
- ½ cup granulated sugar
- 2 large eggs
- 1 teaspoon vanilla extract
- ¼ cup sour cream
- ¼ cup sourdough discard
- 1 cup milk or buttermilk
- 1 teaspoon salt
- 2 teaspoons baking powder
- 2 cups all-purpose flour
Instructions
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Preheat the oven to 350°F. Grease or line an 11×8-inch baking dish.
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Melt the butter for the topping in a microwave-safe bowl. Stir in the brown sugar, flour, and cinnamon with a fork until crumbly, then set aside to cool.
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In a small bowl, stir together the brown sugar, flour, and cinnamon for the filling.
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Cream the softened butter and both sugars in a stand mixer until smooth. Mix in the eggs and vanilla.
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Add the sour cream, milk, and sourdough discard and mix well. Add the flour, salt, and baking powder and mix until smooth, scraping down the sides as needed.
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Spread half the batter in the dish and sprinkle evenly with the filling. Spread the remaining batter over the top, then scatter the crumble topping evenly.
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Bake for 40 to 45 minutes, until golden brown and set in the center. Cool before slicing.
Notes
Store in an airtight container at room temperature for up to 3 days.
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