Baking can be both a relaxing and rewarding experience, especially when you blend traditional flavors with a modern twist. This Three Milks Sourdough Cake offers a delightful combination of moistness and rich flavors that come from a trio of milks. The use of sourdough starter discard adds a unique depth while keeping the cake light and fluffy. Perfect for gatherings or a sweet treat at home, this recipe promises an easy yet enjoyable baking adventure.
Why You’ll Love This Three Milks Sourdough Cake
This cake is easy to prepare, making it a reliable choice for bakers of any skill level. The combination of flavors from the three types of milk provides a comforting sweetness balanced by the tanginess of sourdough. Not only does it fit beautifully into everyday meals, but it also brings a special touch to celebrations, providing practical value for both casual and festive occasions.
Kitchen Tools You’ll Need
- Mixing bowls
- Whisk
- Electric mixer (optional)
- 9×13 baking dish
- Sifter
- Rubber spatula
Ingredients
- 140 grams flour (for structure)
- 8 grams baking powder (for leavening)
- 2 grams salt (enhances flavor)
- 5 eggs (separated; for richness)
- 240 grams sugar (divided; for sweetness)
- 100 grams milk (adds moisture)
- 120 grams sourdough starter discard (for flavor and texture)
- 8 grams vanilla extract (for flavor)
- 354 grams evaporated milk (for creaminess)
- 397 grams sweetened condensed milk (for sweetness)
- 90 grams heavy whipping cream (adds richness)
- 450 grams heavy whipping cream (for frosting; for texture)
- 32 grams powdered sugar (for sweetness in frosting)
- 2 grams vanilla extract (for frosting; enhances flavor)

How to Make Three Milks Sourdough Cake
Step 1. Preheat your oven to 350 degrees F. Lightly grease a 9×13 baking dish to prevent the cake from sticking. Ensuring the oven is at the right temperature is essential for achieving optimal baking results, as it provides the proper environment for the cake to rise evenly.
Step 2. Sift together the flour, baking powder, and salt in a large mixing bowl. Sifting helps to aerate the flour, creating a lighter texture in the cake. It’s a simple step that plays a key role in ensuring the dry ingredients are well mixed and free from clumps.
Step 3. In a separate bowl, whisk together the milk, sourdough starter discard, and vanilla extract until fully combined. This mixture will add moisture and flavor to your cake. The sourdough discard contributes a subtle tang that enhances the overall taste.
Step 4. Beat the egg yolks with 180 grams of sugar in another bowl until they turn pale and creamy. Incorporating air into the yolks at this stage is crucial, as it helps to create a lighter cake. You’ll know it’s ready when the mixture looks fluffy and has lightened in color.
Step 5. Gently stir the prepared milk mixture into the egg yolk mixture until just combined. This will create a rich, velvety base for your batter. Be careful not to overmix, as that could result in a denser cake.
Step 6. In a clean bowl, beat the egg whites until soft peaks form. Gradually add the remaining 60 grams of sugar while continuing to beat until stiff peaks form. Stiff peaks mean the egg whites should hold their shape when you lift the beaters—this is essential for incorporating air into your batter.
Step 7. Fold the egg white mixture into the yolk mixture gently. Use a rubber spatula to carefully incorporate the whites without deflating them. This step is key in achieving a light, airy texture in the finished cake.
Step 8. Combine the batter with the sifted dry ingredients, mixing until just incorporated. This is where all elements come together, resulting in a smooth batter. Look for a homogenous mixture without any visible flour, but avoid overmixing.
Step 9. Pour the batter into the prepared baking dish, spreading it out evenly. This helps ensure that it bakes uniformly throughout, which is important for an even texture and doneness.
Step 10. Bake the cake in your preheated oven for 27-30 minutes. Check for doneness by inserting a toothpick into the center; it should come out clean or with just a few crumbs. The cake should be lightly golden on top and spring back when touched.
Step 11. For the milk syrup, whisk together the evaporated milk, sweetened condensed milk, and heavy cream in a bowl until thoroughly mixed. This syrup will soak into the cooled cake, adding moisture and sweetness.
Step 12. Once the cake has cooled, poke holes in the surface using a fork to help the syrup absorb better. Pour the milk syrup evenly over the cake, allowing it to soak in. Refrigerate the cake for at least 24 hours to let the flavors meld and the cake get pleasantly moist.
Step 13. For the frosting, whisk together the heavy whipping cream, powdered sugar, and vanilla extract in a bowl until it thickens to a spreadable consistency. This creamy frosting will add a luxurious touch to the cake.
Step 14. Spread the whipped frosting evenly over the top of the cake. Feel free to add fruit or a sprinkle of cinnamon for an extra element of flavor if desired.

Serving Suggestions
This Three Milks Sourdough Cake serves as a versatile dessert option, perfect for various occasions. It makes for a delightful breakfast treat, enjoyed simply alongside coffee or tea. As a snack, it satisfies sweet cravings while being easy to cut into portions for family meals. Leftovers can be enjoyed for days, and the cake’s flavors deepen as it sits, making it an ideal make-ahead dessert for gatherings or celebrations.
Pro Tips for Best Results
- Ensure your egg whites are free of yolk; even a small amount can prevent the whites from whipping to stiff peaks.
- Use room temperature eggs and other ingredients for better incorporation and a smoother batter.
- Avoid overbaking by keeping a close eye on the cake in the last few minutes; this ensures it remains moist.
- For a more pronounced vanilla flavor, consider using high-quality vanilla extract.
- After frosting, let the cake sit for a little while before serving for the best texture.
Common Mistakes to Avoid
- Not separating eggs properly: This can cause egg whites to not whip enough. Ensure no yolk gets into the whites for a fluffier cake.
- Overmixing the batter: This can lead to a dense texture. Mix just until combined for the best rise and lightness.
- Skipping the refrigeration step: Failing to chill the cake after soaking won’t allow it to absorb the syrup fully, resulting in a drier cake.
- Not measuring ingredients accurately: Incorrect measurements can alter the texture and flavor. Use a kitchen scale for best results.
- Baking at the wrong temperature: Make sure your oven is properly calibrated. An oven that is too hot can dry out the cake.
- Not testing for doneness: Always check the center with a toothpick to ensure it’s cooked through but not overdone.
Variations & Substitutions
Consider adding different flavor extracts like almond or coconut to the batter for a unique twist. You could also swap out the frosting for a simple dusting of powdered sugar or fresh fruit topping. For a chocolate flavor, a small amount of cocoa powder can be added to the dry ingredients, although it will alter the overall color and richness.
Storage & Reheating
Store the Three Milks Sourdough Cake covered in the refrigerator for up to five days. To keep it fresh at room temperature, tightly wrap it in plastic wrap for about two days. Freezing is possible; just ensure it’s wrapped well to prevent freezer burn. To reheat, gently microwave individual slices for a few seconds, or let it come to room temperature before serving.
Frequently Asked Questions
Can I make this recipe ahead of time?
Yes, this cake can be made a day or two in advance. The flavors meld beautifully when it sits, especially after being soaked in the milk syrup.
How long does it last in the fridge?
The cake lasts in the refrigerator for about five days. Remember to keep it covered to maintain moisture.
Can I freeze this recipe?
Yes, this cake can be frozen. Wrap it well to avoid freezer burn, and it will maintain its quality for up to three months.
What can I substitute for one ingredient?
You can replace the heavy cream with a lower-fat milk option, but keep in mind the texture and richness of the frosting might be affected.
Why didn’t my recipe turn out as expected?
Common reasons include mismeasured ingredients, not beating the egg whites enough, or baking at the wrong temperature. Each factor significantly affects the cake’s texture and flavor.
Final Thoughts
Making this Three Milks Sourdough Cake is a straightforward process that rewards you with delightful flavors and textures. It’s a lovely addition to any meal or occasion. When you cut into this cake, the moistness and rich layers will undoubtedly bring comfort to your day. Enjoy the process and the satisfying experience that comes with sharing this delicious dessert with family and friends.

Three Milks Sourdough Cake
Ingredients
Main Ingredients
- 140 grams flour for structure
- 8 grams baking powder for leavening
- 2 grams salt enhances flavor
- 5 large eggs separated; for richness
- 240 grams sugar divided; for sweetness
- 100 grams milk adds moisture
- 120 grams sourdough starter discard for flavor and texture
- 8 grams vanilla extract for flavor
- 354 grams evaporated milk for creaminess
- 397 grams sweetened condensed milk for sweetness
- 90 grams heavy whipping cream adds richness
- 450 grams heavy whipping cream for frosting; for texture
- 32 grams powdered sugar for sweetness in frosting
- 2 grams vanilla extract for frosting; enhances flavor
Instructions
Preparation
- Preheat your oven to 350 degrees F. Lightly grease a 9×13 baking dish.
- Sift together the flour, baking powder, and salt in a large mixing bowl.
- In a separate bowl, whisk together the milk, sourdough starter discard, and vanilla extract until fully combined.
- Beat the egg yolks with 180 grams of sugar in another bowl until pale and creamy.
- Gently stir the prepared milk mixture into the egg yolk mixture until just combined.
- In a clean bowl, beat the egg whites until soft peaks form. Gradually add the remaining 60 grams of sugar while continuing to beat until stiff peaks form.
- Fold the egg white mixture into the yolk mixture gently using a rubber spatula.
- Combine the batter with the sifted dry ingredients, mixing until just incorporated.
Baking
- Pour the batter into the prepared baking dish and spread it out evenly.
- Bake the cake in your preheated oven for 27-30 minutes. Check for doneness using a toothpick.
Milk Syrup
- For the milk syrup, whisk together the evaporated milk, sweetened condensed milk, and heavy cream in a bowl.
- Once the cake has cooled, poke holes in the surface using a fork and pour the milk syrup evenly over the cake. Refrigerate for at least 24 hours.
Frosting
- For the frosting, whisk together the heavy whipping cream, powdered sugar, and vanilla extract until it thickens.
- Spread the whipped frosting evenly over the top of the cake.



