One-Bowl Sourdough Vanilla Cake
This one-bowl sourdough vanilla cake is the easiest way to use up leftover starter. It bakes up tender with a fine crumb and a buttery vanilla scent that fills the kitchen.
No mixer needed and no waiting for a rise. You just stir, pour, and bake for a simple dessert you can count on any night.
Why This Sourdough Cake Works
The sourdough discard gives the cake a subtle tang that rounds out the vanilla and keeps it moist for days. I reach for this recipe when I want a no-fuss dessert that still feels special.
It comes together in one bowl with a whisk — no creaming butter or sifting flour. The result is a golden loaf that slices clean and stays soft, even if it sits on the counter overnight.
Ingredients
- 1 1/2 cups all-purpose flour: spooned and leveled, not scooped, for the most tender crumb
- 1 cup granulated sugar: keeps the cake sweet and tender
- 1/2 cup unsalted butter, melted and slightly cooled: lends a rich, buttery flavor
- 2 large eggs: room temperature is ideal, but straight from the fridge works too
- 1 cup sourdough discard, unfed: use it cold right out of the fridge
- 1/2 cup whole milk: warmed slightly so it doesn’t seize the melted butter
- 2 teaspoons vanilla extract: the better the vanilla, the more it sings
- 1 1/2 teaspoons baking powder: gives the cake a reliable lift
- 1/2 teaspoon baking soda: reacts with the sourdough’s acidity for extra tenderness
- 1/2 teaspoon fine sea salt: balances the sweetness and brings out the vanilla
- Powdered sugar, for dusting: optional, but pretty
Variations / Substitutions
- Buttermilk for milk: swap in an equal amount; the cake will be even tangier and the crumb a bit more tender.
- Dairy-free: use a neutral oil like avocado oil instead of butter, and your favorite unsweetened non-dairy milk. The cake leans a little less rich but still soft.
- Lemon zest: rub a tablespoon of finely grated lemon zest into the sugar before whisking for a bright, sunny twist.
- Add berries: fold 1 cup of fresh blueberries or raspberries into the batter just before pouring it into the pan.
- Chocolate version: try the same method with Sourdough Chocolate Cake if you want a cocoa-rich loaf.
How to Make One-Bowl Sourdough Vanilla Cake
Step 1: Whisk the Wet Ingredients
In a large bowl, whisk together 1 cup sugar and 1/2 cup melted unsalted butter until smooth and glossy. Add 1 cup sourdough discard, 1/2 cup whole milk, 2 large eggs, and 2 teaspoons vanilla extract and whisk until the mixture is even and no streaks of egg remain.
The discard will loosen as it mixes in, and the batter will look slightly bubbly. That’s the acidity from the starter getting to work — it’ll help the cake rise nice and tall.
Step 2: Fold in the Dry Ingredients
Sprinkle 1 1/2 cups flour, 1 1/2 teaspoons baking powder, 1/2 teaspoon baking soda, and 1/2 teaspoon salt over the wet mixture. Use a spatula to fold gently just until the flour disappears, scraping the bottom of the bowl so no pockets of dry mix hide there.
The batter will be thick but pourable. A few small lumps are okay — overmixing will make the cake tough.
Step 3: Bake the Cake
Heat the oven to 350°F (175°C) and grease a 9-by-5-inch loaf pan. Pour the batter into the pan and smooth the top lightly with the spatula. Bake for 45 to 50 minutes, until a toothpick inserted in the center comes out clean and the top is deeply golden.
The kitchen will smell like warm vanilla and butter. A few cracks on the surface are normal and mean the crumb is light underneath.
Step 4: Slice and Serve
Let the cake cool in the pan for 10 minutes, then turn it out onto a rack to cool completely. Dust with powdered sugar if you like.
Slice into thick pieces and serve. The crumb is tender and faintly tangy, with a soft vanilla finish.
A Few Notes Before You Start
- Cold discard straight from the fridge works perfectly — no need to bring it to room temperature first.
- If your discard is very thin (100% hydration), reduce the milk by 2 tablespoons so the batter doesn’t turn loose.
- Ovens vary, so check the cake at 40 minutes. When it’s done, the top springs back when pressed lightly.
- For a taller loaf, use an 8-by-4-inch pan and add about 5 minutes to the bake time.
- Sour cream or plain yogurt can replace the milk for an even softer crumb.
Bake times by pan:
| Pan size and material | Approximate bake time |
|---|---|
| 9×5-inch loaf, metal | 45–50 mins |
| 8×4-inch loaf, metal | 50–55 mins |
| 9-inch round, metal | 35–38 mins |
Storing and Freezing
Keep the cake covered at room temperature for up to 3 days — it stays moist without any extra wrapping. For longer storage, wrap it tightly and refrigerate for up to a week; let it come to room temperature before serving for the best texture. Freeze slices layered with parchment in an airtight container for up to 2 months.
What to Serve with This Cake
A handful of fresh strawberries macerated with a pinch of sugar brings a juicy contrast that plays off the cake’s tang. A scoop of vanilla ice cream works nicely, the cold creaminess melting into the tender crumb. For breakfast, a light drizzle of honey complements the subtle sourdough flavor without overpowering it.
Frequently Asked Questions
Can I use active starter instead of discard?
Yes. The cake will have a milder tang and rise slightly higher. Reduce the baking powder to 1 teaspoon to avoid an overly puffy top.
Can I make this gluten-free?
Yes. Use a 1:1 gluten-free flour blend that contains xanthan gum. The crumb will be a bit more delicate, so cool the cake completely before slicing.
Can I use oil instead of butter?
Yes. Melted coconut oil or a neutral oil like avocado oil works well. The flavor will be less buttery, so consider adding an extra 1/2 teaspoon of vanilla.
Can I add chocolate chips?
Yes. Fold 1/2 cup of semisweet or dark chocolate chips into the batter after the dry ingredients are just combined.
One-Bowl Sourdough Vanilla Cake Recipe
Ingredients
Method
- In a large bowl, whisk together the sugar and melted butter until smooth. Add the sourdough discard, milk, eggs, and vanilla and whisk until even.
- Sprinkle the flour, baking powder, baking soda, and salt over the wet mixture. Fold gently with a spatula just until no streaks of flour remain.
- Heat oven to 350°F (175°C) and grease a 9-by-5-inch loaf pan. Pour the batter in and smooth the top. Bake 45 to 50 minutes, until a toothpick comes out clean.
- Cool the cake in the pan for 10 minutes, then turn out onto a rack to cool completely. Slice and serve dusted with powdered sugar if desired.
