Name: Moist Sourdough Apple Donut Cake Recipe
Prep time: 15 min
Cook time: 38 min
Total time: 53 min
Cuisine: American
Ingredients: 80 grams whole milk; 1 teaspoon lemon juice; 130 grams brown sugar; 1 egg, room temperature; 70 grams sourdough discard, room temperature; 40 grams sunflower or grapeseed oil; 3/4 teaspoon vanilla bean paste; 140 grams all purpose flour; 1 1/2 teaspoons baking powder; 1/2 teaspoon + 1/8 teaspoon fine sea salt; 205 grams quartered apple wedges; 3 tablespoons granulated sugar; 1/2 teaspoon ground cinnamon; Pinch of salt

Jump to Recipe· 4.1 from 13 reviews

If you have a soft spot for cozy, comforting desserts, you are going to fall head over heels for this Moist Sourdough Apple Donut Cake Recipe. This delightful cake blends the tangy charm of sourdough discard with tender apple pieces and a cinnamon sugar topping, delivering a symphony of flavors and textures in every bite. It’s uniquely satisfying—moist and tender like your favorite donut, but with the heartiness of a cake, making it absolutely perfect for breakfast, a midday snack, or a sweet ending to any meal.

Ingredients You’ll Need

The image shows three main elements placed on a white marbled surface: on the top left, a beige bowl filled with white flour and some brown spices in the middle layer; on the right, a clear glass bowl containing one raw egg yolk (bright yellow) next to a pile of light brown sugar and a dollop of light beige wet mixture, with a metal whisk resting inside; and on the bottom left, a white speckled board holding a whole shiny red apple and two apple wedges with light yellow flesh facing up. Photo taken with an iphone --ar 4:5 --v 7

The beauty of this Moist Sourdough Apple Donut Cake Recipe is in its simplicity. Each ingredient is carefully chosen not just for flavor but also for texture and color—resulting in a cake that feels homemade and special, without needing dozens of complicated components.

Whole milk (80 grams): Combined with lemon juice to create a charming homemade buttermilk substitute that tenderizes the crumb.
Lemon juice (1 teaspoon): Adds just the right touch of acidity to activate the baking powder and brighten the flavors.
Quartered apple wedges (205 grams): Fresh apples bring natural sweetness and moisture, creating those little bursts of fruity delight that are pure magic in this cake.
Brown sugar (130 grams): Deep, caramel-like sweetness that complements the sourdough and apples beautifully.
Egg (1, room temperature): Provides structure and richness to bind everything into a dreamily soft cake.
Sourdough discard (70 grams, room temp preferred): The star ingredient, adding tanginess and a lovely tender crumb without any extra effort.
Sunflower or grapeseed oil (40 grams): Keeps the cake moist and light compared to butter’s denser texture.
Vanilla bean paste (¾ teaspoon): Infuses subtle warmth and enhances all the other flavors.
All-purpose flour (140 grams): The classic base that supports the cake’s structure without weighing it down.
Baking powder (1½ teaspoons): Gives the perfect rise, ensuring that tender crumb with just a little spring.
Fine sea salt (⅝ teaspoon total): Balances the sweetness and lifts the overall flavor.
Topping – granulated sugar (3 tablespoons), ground cinnamon (½ teaspoon), pinch of salt: An irresistible spiced sugar crust that makes each slice sparkle and crackle just right.

How to Make Moist Sourdough Apple Donut Cake Recipe

Step 1: Create Your Faux Buttermilk

Start by stirring together the whole milk and lemon juice. This simple step might seem small, but it’s crucial. The acidity gently curdles the milk just enough to mimic buttermilk’s moisture and tang, which helps keep the cake incredibly tender and flavorful throughout baking.

Step 2: Prepare the Apples

For that lovely texture in every bite, slice your apple wedges paper-thin using a mandoline or a very sharp knife. Then, cut these thin slices into small rectangular sticks. Don’t worry if they aren’t perfect—the goal is to keep the apples from overpowering the batter while still offering delicious, juicy bits spread throughout.

Step 3: Mix the Wet Ingredients

In a large bowl, whisk together the brown sugar, egg, and sourdough discard until fully combined. This is the base of your Moist Sourdough Apple Donut Cake Recipe’s lovely sourdough flavor and sweetness. Adding the oil, milk mixture, and vanilla bean paste next ensures a silky, smooth batter that guarantees moistness.

Step 4: Combine Dry Ingredients

Whisk the flour, baking powder, and salt in a separate small bowl to evenly distribute the leavening and seasoning. This will help the cake rise evenly and have a uniform crumb.

Step 5: Bring It All Together

Add the dry ingredients to the wet mixture and stir gently with a spatula until things are roughly half combined. Then fold in those apple pieces carefully—overmixing at this stage could toughen your cake, and we definitely want all the softness intact. The batter should be a bit lumpy and studded with vibrant apple bits.

Step 6: Prepare for Baking

Transfer your batter to a greased or parchment-lined 8×8 baking pan (avoid glass pans here to ensure even baking). Use the back of a spoon to smooth the surface, then sprinkle the topping mixture—granulated sugar, cinnamon, and a pinch of salt—evenly over the top. This sweet crunch will be the perfect finish once baked.

Step 7: Bake Your Cake

Lower the oven temperature to 325 degrees Fahrenheit and bake for 35 to 38 minutes. Keep an eye out and use a toothpick to check doneness; it should come out with a few moist crumbs but not wet batter. The result? A moist, tender cake that carries the perfect balance of sourdough tang, apple sweetness, and warm cinnamon notes.

How to Serve Moist Sourdough Apple Donut Cake Recipe

A square piece of soft yellow cake sits on a white plate with a melted pat of butter on top, mixing into a layer of dark brown cinnamon sugar powder covering the upper surface. The cake has a crumbly texture in the lower half, while the top looks slightly crisp and uneven with cinnamon sugar. A gold fork with a white handle is touching the side of the cake, breaking a small piece off, with some crumbs scattered around. The white plate rests on a white marbled surface. Photo taken with an iphone --ar 4:5 --v 7

Garnishes

For an inviting presentation, dust the top with a light sprinkle of powdered sugar or add a drizzle of honey or maple syrup. Fresh apple slices or a few toasted nuts scattered on top can add a welcome crunch and make the dessert feel even more special.

Side Dishes

This cake pairs wonderfully with a cozy cup of coffee or tea, making it a great choice for brunch or an afternoon treat. A scoop of vanilla ice cream or a dollop of whipped cream elevates it into a decadent dessert perfect for sharing with friends and family.

Creative Ways to Present

Try cutting the cake into small squares and serving on a charcuterie board alongside cheeses, fresh fruits, and nuts for a unique dessert platter. You can also turn slices into a breakfast parfait layered with Greek yogurt and granola, transforming the Moist Sourdough Apple Donut Cake Recipe into a versatile star for any occasion.

Make Ahead and Storage

Storing Leftovers

Store any leftover cake tightly wrapped or in an airtight container at room temperature for up to two days. Because it’s so moist, avoid leaving it uncovered to prevent drying out.

Freezing

To preserve this cake’s freshness, wrap individual slices in plastic wrap and then place them in a freezer-safe container or bag for up to three months. This lets you enjoy your cake anytime without losing its beloved texture or flavor.

Reheating

When ready to enjoy again, thaw the cake slice at room temperature and warm gently in a microwave for 15-20 seconds or in a low oven until just warmed through. A quick reheat revives that soft, tender crumb and the cinnamon sugar topping’s welcoming aroma.

FAQs

Can I use sourdough starter instead of discard for this recipe?

While this recipe specifically calls for sourdough discard to keep the balance of flavors and moisture, you can try using an active starter, but you may need to adjust the liquid quantities since an active starter is more hydrated. Using discard offers the best tang and texture here.

What kind of apples work best for the donut cake?

Firm, slightly tart apples like Granny Smith, Honeycrisp, or Braeburn are ideal. They provide a nice balance to the sweetness of the cake and hold their shape well during baking without turning mushy.

Can I substitute oil with melted butter?

Yes, you can! Melted butter will add a richer flavor, but it may make the cake slightly denser. Both options keep the cake moist, so choose based on your flavor preference.

How important is letting the sourdough discard come to room temperature?

Letting the discard come to room temp helps it incorporate smoothly into the batter, avoiding clumps and ensuring even distribution of flavor and texture. It’s a simple step that makes a noticeable difference.

Is this cake suitable for freezing before baking?

It’s best to bake the cake first, then freeze leftovers as slices. The batter doesn’t freeze well and may affect the rise and texture. Baking before freezing keeps that perfect Moist Sourdough Apple Donut Cake Recipe experience intact.

Final Thoughts

This Moist Sourdough Apple Donut Cake Recipe is the kind of recipe that feels like a warm hug from the inside out. Whether you’re a sourdough enthusiast looking to reduce discard waste or simply craving a comforting treat with a twist, this cake delivers on all fronts. Once you try it, you’ll find yourself reaching for it again and again—perfectly moist, gently spiced, and full of cozy apple goodness.