The Best Sourdough Vanilla Cake You’ll Ever Bake

I’m usually team chocolate when it comes to cake or cupcakes. But this sourdough vanilla cake made me question everything. One bite of that soft, sweet crumb topped with rich vanilla buttercream, and I thought… maybe I’ve had it wrong my whole life.

This isn’t just any vanilla cake. It’s a sourdough vanilla cake with a tender crumb, a moist, fluffy texture. The sourdough discard brings depth to the vanilla flavor without making the cake taste sour. Paired with a cloud of homemade buttercream, it’s the kind of sweet cake that belongs on birthday tables, celebration spreads, or just your average Tuesday night. It’s that good.

This post may contain affiliate links. Please read our disclosure policy.

Whether you’re swimming in extra sourdough discard, craving something a little more special, or just want a simple cake with unforgettable flavor, this recipe is for you. From the texture of the cake to the perfect balance of cake to buttercream, it’s a total standout and will be the best sourdough vanilla cake you’ll ever bake, hands down!

Why This Is the Best Sourdough Vanilla Cake You’ll Ever Bake

Let’s start with the crumb. It’s tender, soft, and buttery, and is everything you want in a vanilla cake. But what sets this one apart is the texture: a perfect balance of light and moist, thanks to a combination of butter, oil, and milk. That trio keeps each layer rich without being heavy, and soft without falling apart. You’ll get beautiful, even layers that are easy to stack and slice, with a melt-in-your-mouth bite every time.

Now, let’s talk sourdough. The discard adds the slightest tang. It’s not enough to scream “sourdough,” but just enough to deepen the flavor and give this cake an edge over every basic vanilla cake out there. It brings character and it makes people ask, “what’s in this?” in the best way possible.

This cake bakes up tall and even, with golden edges that don’t dry out. It’s sturdy enough to hold three generous layers of buttercream, but soft enough to be fork-tender. Whether you use a stand mixer or a hand mixer, the batter comes together easily and bakes like a dream.

And then there’s the frosting. A cloud of whipped vanilla buttercream that glides over the top of each layer and fills every bite with just the right amount of sweetness. Together, the cake and frosting are balanced, flavorful, and absolutely unforgettable.

This is the vanilla cake you’ll come back to for birthdays, celebrations, or honestly, just because it’s Tuesday and you want something amazing. If you’ve never baked a sourdough cake before, let this be your first. If you already have, this one’s going to top it!

The Key Ingredients to Make the Perfect Sourdough Vanilla Cake

A great cake starts with great ingredients, and in this case, just a few key components work together to create a soft, moist, and flavorful vanilla cake with sourdough discard that sets it apart.

• Unsalted Butter: Softened butter adds rich flavor and structure. It helps create a cake that’s tender, but still strong enough to stack into three beautiful layers. You want it softened to room temperature. It should hold its shape but give slightly when pressed. If it’s melted or greasy, it won’t cream properly with the sugar, and you’ll lose that light, airy texture we’re after.
• Vegetable Oil: Oil adds moisture that lasts for days. Where butter brings flavor, oil ensures the crumb stays soft and never dry, which is especially important for a layered cake.
• Sugar: Classic granulated sugar sweetens the cake and helps create that perfect golden edge as it bakes. It also works with the butter and eggs to build structure and volume.
• Eggs: Eggs provide structure, richness, and help emulsify the batter. They play a big role in keeping the cake stable while still being tender and fluffy.
• Milk: Whole milk adds moisture and fat, both of which contribute to a smooth, velvety crumb. Be sure it’s at room temperature so it blends evenly into the batter.
• Sourdough Discard: A young sourdough discard (one that’s been recently fed or hasn’t been sitting in the fridge for too long) is ideal. It’s milder in flavor, which means you’ll get all the benefits of sourdough without an overpowering tang. It also helps with texture, giving the cake a slightly more open crumb and a unique depth of flavor that elevates it from your average vanilla cake.
• Vanilla Extract: Use a good-quality vanilla extract. This cake is all about that warm, classic vanilla flavor, so don’t skimp here. The vanilla ties everything together and makes the cake feel truly special. Every time I make this sourdough vanilla cake, my husband can’t stop talking about how much vanilla flavor the cake has compared to a store bought cake!
• Flour, Baking Powder, and Baking Soda: All-purpose flour gives the cake its structure, while baking powder and baking soda help it rise beautifully. The balance of leavening agents is key to a tall, fluffy cake with a soft, even crumb.

Leveling Your Sourdough Vanilla Cakes & Buttercream Between Layers

For a beautiful, professional-looking 3-layer cake, leveling your cake layers is super important. It ensures each layer sits flat and even, which means your cake won’t wobble or lean once assembled.

How to Level Your Cakes

Once your cakes have fully cooled (this is important!), place each layer on a flat surface or cake board. Using a serrated knife or a cake leveler, gently slice off the domed top of the cake to create a flat, even surface. Take your time, it’s better to cut off a little at a time than too much at once.

If your layers are already fairly flat, just trimming the very top edge will help your cake stack neatly without gaps.

How Much Buttercream to Use Between Layers

When it comes to filling the layers, you want enough buttercream to add moisture and flavor, but not so much that the cake slides or becomes unstable.

• For an 9-inch cake, a generous 1 cup of buttercream between each layer works beautifully. Spread it evenly with an offset spatula or a butter knife.
• Save the rest of your buttercream for the outside frosting and any decorations or piping you want to do.

Tips for the Perfect Sourdough Vanilla Cake

This sourdough vanilla cake recipe is already a winner, but these tips will help you get the best results every single time.

• Use a kitchen scale if you have one. Precise measurements for your dry ingredients and liquid ingredients make a huge difference in the final texture of the cake.
• For a smooth cake batter, make sure your butter is soft (but not melted), your eggs are at room temp, and your milk and sourdough discard isn’t cold. This helps the wet ingredients blend evenly with the flour mixture and creates a more even rise.
• This cake shines with a young sourdough starter discard, meaning it hasn’t been sitting in the fridge for days. A fresh discard gives the cake a soft moist crumb without making the cake taste sour.
• After you combine your wet and dry ingredients (in a large mixing bowl or stand mixer bowl), mix on medium speed just until everything is combined. Scrape the sides of the bowl with a spatula to make sure no dry bits are hiding. Overmixing can lead to a dense cake instead of a light, beautiful cake.
• Use cake pans that are greased and lined with parchment paper on the bottom for easy release. For even baking, try to divide the batter into equal parts. You can use a scale or measuring cups to portion it out.
• Once baked, let the cake layers cool completely, then transfer to a wire rack. Be sure to allow your cakes to fully cool for icing.

Did you try this recipe? I’d love to see how it turned out! Leave a comment below and tag @catchthecrumbsourdough on Instagram to show it off!