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If you’ve been looking for a simple way to use extra sourdough starter, this sourdough vanilla cake recipe turns humble ingredients into a soft, tender cake with rich homemade flavor. And when that cake is made with sourdough starter, it carries an extra depth of flavor that makes it feel even more from-scratch.

This sourdough vanilla cake is soft, tender, and lightly sweet with just a gentle hint of tang from sourdough discard. It’s a wonderful way to use extra starter while baking a cake that feels both classic and rustic.

If you’ve been searching for a simple sourdough cake recipe, this one is beginner-friendly and perfect for birthdays, gatherings, or an afternoon treat with coffee.

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Why Bake a Cake With Sourdough?

Using sourdough in cakes might sound unusual at first, but it works beautifully.

Sourdough discard adds a subtle depth of flavor, extra moisture, natural fermentation benefits, and less food waste in the kitchen. Instead of throwing away extra starter, you can transform it into something delicious.

And in a vanilla cake, the tang remains delicate with just enough to make the flavor richer without overpowering the sweetness.

Ingredients for Sourdough Vanilla Cake

Simple pantry staples come together to create this tender cake.

Dry Ingredients

• 2 cups all-purpose flour
• 1 teaspoon baking soda
• ½ teaspoon baking powder
• ½ teaspoon salt

Wet Ingredients

• ½ cup unsalted butter, softened
• 1 cup sugar
• 2 eggs
• 1 cup sourdough discard (unfed starter)
• ½ cup milk
• 1 tablespoon vanilla extract

Optional additions:

• Vanilla bean paste for deeper flavor
• Lemon zest for brightness

How to Make Sourdough Vanilla Cake

This recipe comes together quickly and doesn’t require long fermentation.

1. Preheat the Oven

Preheat your oven to 350°F.

Grease an 8x8 baking pan or 9-inch round cake pan.

2. Cream Butter and Sugar

In a mixing bowl, beat together:

• Butter
• Sugar

Mix until light and fluffy.

This step helps create a tender crumb.

3. Add Eggs and Vanilla

Beat in the eggs one at a time.

Then mix in the vanilla extract.

4. Add the Sourdough Discard

Stir in the sourdough discard until fully combined.

The batter may look slightly textured and that’s completely normal.

5. Combine Dry Ingredients

In a separate bowl, whisk together the flour, baking soda, baking powder, and salt.

6. Mix the Batter

Add the dry ingredients to the wet ingredients alternately with the milk.

Mix gently until just combined.

Avoid overmixing, which can make the cake dense.

7. Bake

Pour the batter into the prepared pan.

Bake for 30–35 minutes, or until a toothpick inserted in the center comes out clean.

Allow the cake to cool for at least 15 minutes before slicing.

Optional Vanilla Buttercream Frosting

For a classic finish, spread a simple buttercream frosting on top.

Ingredients

• ½ cup softened butter
• 2 cups powdered sugar
• 2 tablespoons milk
• 1 teaspoon vanilla extract

Beat everything together until smooth and fluffy.

Spread over the cooled cake.

Tips for the Best Sourdough Cake

A few small details make a big difference.

Use room temperature ingredients
This helps everything mix evenly.

Use active or discard starter
Either works, as the baking soda provides the rise.

Don’t overmix
A gentle batter keeps the cake soft.

Let the cake cool before frosting
Warm cake will melt the frosting.

Long-Fermented Option (For Better Digestibility)

If you prefer long-fermented sourdough baking, you can adapt this recipe.

1. Mix flour, milk, and sourdough starter first.
2. Cover and ferment overnight (8–12 hours).
3. Add remaining ingredients the next day before baking.

This method enhances flavor and traditional sourdough benefits.

Flavor Variations

Once you’ve made the base recipe, it’s easy to customize.

Try adding:

Sourdough Lemon Cake

Add lemon zest and lemon glaze.

Sourdough Berry Cake

Fold in fresh blueberries or raspberries.

Sourdough Vanilla Bean Cake

Use vanilla bean paste for a richer flavor.

Sourdough Snack Cake

Bake in a square pan and serve unfrosted for a simple afternoon treat.

Storing Sourdough Vanilla Cake

This cake keeps well and stays moist for several days.

Room temperature:
Store covered for 2–3 days.

Refrigerator:
Keeps for up to 5 days.

Freezer:
Wrap slices individually and freeze for up to 2 months.

Frequently Asked Questions About Sourdough Vanilla Cake

Can I use sourdough discard in this vanilla cake?

Yes! This recipe is perfect for sourdough discard. The starter adds moisture and a subtle depth of flavor without making the cake overly tangy.

Does sourdough vanilla cake taste sour?

Not usually. In most cases, the sourdough flavor is very mild. The sugar, butter, and vanilla balance the flavor so the cake tastes rich and slightly complex rather than sour.

Can I make this cake with active sourdough starter?

Yes. Both active starter and discard work well in this recipe. Since the cake uses baking soda and baking powder for rise, the starter doesn’t need to be freshly fed.

How long does sourdough vanilla cake stay fresh?

Stored in an airtight container, sourdough vanilla cake will stay fresh:

• 2–3 days at room temperature
• Up to 5 days in the refrigerator

For best texture, allow refrigerated cake to come to room temperature before serving.

Can I freeze sourdough vanilla cake?

Yes. Wrap slices or the entire cake tightly in plastic wrap and store in a freezer-safe container. It can be frozen for up to 2 months. Thaw overnight in the refrigerator or on the counter.

Can I turn this into cupcakes?

Absolutely. Simply divide the batter into a lined muffin tin and bake at 350°F for about 18–22 minutes, or until a toothpick inserted in the center comes out clean.

Why is my sourdough cake dense?

A dense cake usually happens when the batter is overmixed or when the baking soda and baking powder are old. Mix gently and make sure your leavening agents are fresh for the best results.

Can I long-ferment this sourdough cake?

Yes. If you prefer long-fermented sourdough baking, mix the flour, milk, and sourdough starter first and let it rest covered for 8–12 hours before adding the remaining ingredients and baking.

What frosting pairs best with sourdough vanilla cake?

This cake pairs beautifully with simple frostings such as:

• Classic vanilla buttercream
• Cream cheese frosting
• Lemon glaze
• Honey whipped cream

Each option complements the subtle flavor of the sourdough starter.

A Simple Cake for a From-Scratch Kitchen

Some recipes become favorites not because they’re fancy, but because they’re dependable.

This sourdough vanilla cake is the kind you make when your sourdough jar is overflowing, you want something sweet but simple, guests are coming by, or the afternoon simply calls for cake. It’s humble baking at its best: warm, practical, and deeply satisfying.

And once you make it, it may become one of those recipes that lives quietly in the back of your recipe box, ready whenever you need it.

If you make this recipe, be sure to leave me a star rating and a comment below. Share what you made and tag me on Instagram@keepingitholistic! For more simple sourdough recipes & guidance, small-space gardening tips, and cozy, slow living inspiration, subscribe to my newsletter and follow me on YouTube and Instagram!

Bake Your First Loaf in 7 Days

This free, simple sourdough starter guide walks you step-by-step through creating, feeding, and baking with your very own sourdough starter without overwhelm. Simple, everyday sourdough recipes included.

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