Sourdough Coffee Cake That Became My Permanent Sunday Morning Recipe

This sourdough coffee cake has replaced every other weekend baking project in my kitchen. It uses starter or discard to create a tender crumb with just enough tang to balance the cinnamon-sugar topping. The culture adds moisture that keeps it soft for days. I've made it so many Sunday mornings that I don't measure the streusel anymore—my hands just know. It's the kind of recipe that turns sourdough skeptics into believers, one crumbly, coffee-dunked bite at a time.

TL;DR: The streusel is non-negotiable. A coffee cake without streusel is just cake. I layer it in the middle and on top so every bite has that brown sugar-cinnamon crunch. The pecans are optional. I always

I had 200g of discard sitting in a jar on the counter. Again. I was tired of pancakes. Tired of crackers. I wanted something that felt like a real baking project but took under an hour. Coffee cake. The discard adds moisture and a subtle tang that balances the sweetness of the streusel. This cake is soft in the middle, crispy on top, and goes perfectly with a hot cup of coffee. Or tea. Or eaten straight from the pan with your hands at 10 PM. No judgment.

Why Sourdough Discard Works in Coffee Cake

Traditional coffee cake uses buttermilk or sour cream for moisture and acidity. Sourdough discard does the same job — it's acidic, it's liquid, and it adds a faint fermented depth that makes people ask "what's in this?" in a good way. The discard also reacts with baking soda to give the cake a light, tender crumb without needing yeast or a long rise.

The streusel is non-negotiable. A coffee cake without streusel is just cake. I layer it in the middle and on top so every bite has that brown sugar-cinnamon crunch. The pecans are optional. I always add them.

What You Need

Ingredients

Ingredient	Amount	Notes
Sourdough discard	200g	Room temperature. Up to 2 weeks old is fine.
All-purpose flour	200g	Don't use bread flour here — too much protein makes a tough cake.
Granulated sugar	100g	Sweetens the batter. Streusel adds more on top.
Eggs	2 large	Room temperature for even mixing.
Whole milk	120g	Full-fat gives the best texture.
Unsalted butter, melted	60g	Cooled slightly so it doesn't cook the eggs.
Baking soda	1 tsp	Reacts with discard acidity for leavening.
Fine sea salt	1/2 tsp	Balances sweetness.
Ground cinnamon	1 tsp	In the batter. More goes in the streusel.
Vanilla extract	1 tsp	Use real vanilla, not imitation.

Streusel Topping

• 80g brown sugar
• 60g all-purpose flour
• 50g cold unsalted butter, cubed
• 1 tsp ground cinnamon
• 40g chopped pecans (optional but recommended)

How to Make Sourdough Coffee Cake

Step 1: Make the Streusel

Combine brown sugar, flour, cold butter, cinnamon, and pecans in a small bowl. Rub the mixture between your fingertips until it forms coarse crumbs with some larger clumps. Don't overwork it — you want pieces, not a paste. Refrigerate while you make the batter.

Step 2: Mix the Wet Ingredients

In a large bowl, whisk the sourdough discard, eggs, milk, melted butter, and vanilla extract until smooth. The discard will break down into the liquid easily. No lumps should remain.

Step 3: Mix the Dry Ingredients

In a separate bowl, combine the flour, baking soda, salt, and cinnamon. Stir with a fork to distribute evenly.

Step 4: Combine

Pour the wet mixture into the dry. Fold gently with a spatula until just combined. A few small lumps are fine. Overmixing develops gluten, which makes the cake tough instead of tender. Stop while the batter still looks slightly streaky.

Step 5: Layer

Grease a 9-inch square baking pan and line the bottom with parchment. Pour in half the batter and spread smooth. Sprinkle half the streusel evenly over the surface. Pour the remaining batter on top and spread gently. Cover with the remaining streusel. Press the streusel lightly into the batter so it sticks during baking.

Step 6: Bake

Bake at 350°F (175°C) for 35-40 minutes. The top should be golden and a toothpick inserted in the center should come out clean or with a few moist crumbs. Cool in the pan for 15 minutes. Slice into 9 squares and serve warm or at room temperature.

Troubleshooting Sourdough Coffee Cake

Problem	Fix
Sunken middle	Underbaked or oven door opened too early. Bake until a toothpick comes out clean. Don't peek before 30 minutes.
Dry and crumbly	Overbaked or too much flour. Measure flour by weight, not volume. Check at 35 minutes.
Streusel melted into the cake	Butter was too soft when making the streusel. Use cold butter straight from the fridge.
Tastes too sour	Discard was very old or very acidic. Use discard that's no more than 1 week old for the mildest flavor.

And if you don't have a starter yet, get a free 288-year-old heritage culture — free with just $4.95 shipping.

Frequently Asked Questions

Can I use active sourdough starter instead of discard?

Yes, but reduce the amount to 150g and add 1 extra tablespoon of milk. Active starter is thicker and less acidic than discard. The cake will rise slightly more and taste milder. Both work well.

Can I make this dairy-free?

Yes. Substitute the milk with oat milk or almond milk. Use melted coconut oil instead of butter in the batter. For the streusel, use vegan butter or coconut oil chilled solid. The texture will be slightly different but still very good.

How long does sourdough coffee cake last?

Cover and store at room temperature for 2 days, or refrigerate up to 5 days. The streusel softens after day 1, so eat it fresh if you want crunch. Warm leftovers in a 300°F (150°C) oven for 5 minutes to revive the top.

Can I double this recipe?

Yes. Bake in a 9x13-inch pan for 40-45 minutes. The batter scales directly. You may need slightly more streusel — go by eye and make enough to cover the surface generously.

Can I add fruit to this coffee cake?

Yes. Fold 1 cup of blueberries or diced apples into the batter before layering. Frozen fruit works — don't thaw first or it'll bleed into the batter. Reduce the streusel slightly if the fruit adds a lot of moisture.

Why baking soda and not baking powder?

Baking soda needs acid to activate. Sourdough discard is acidic. The two react to create lift. Baking powder contains its own acid and would make the cake rise too much and then collapse. Stick with soda for this recipe.

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