Desserts
This 1kg plum cake recipe delivers restaurant-quality layers of tender sponge and jammy plum filling—all baked in a single tin. The secret lies in a precise balance of butter and sugar, creating a moist crumb that stays fresh for days. I’ve perfected this technique over years of baking, ensuring every slice delivers that perfect harmony of sweet sponge and fruity jam.
What sets this recipe apart is the foolproof layering method, where the cake batter is divided and baked in stages with jam filling in between. No specialized equipment is needed—just a standard 9-inch round tin and patience for the layers to set. The result? A cake that’s rich, flavorful, and impressive enough for special occasions yet simple enough for a weeknight treat.
The cake’s moist texture comes from a combination of creamed butter and sugar, plus a touch of sour cream to keep it tender. The plum jam filling adds bursts of fruity sweetness that cut through the richness, making each bite balanced and satisfying. Once baked, the cake rests briefly to allow the layers to meld, ensuring every slice is perfectly structured.
Whether you’re serving it at a brunch, potluck, or simply indulging in a slice with tea, this plum cake is designed to impress. The recipe scales easily for larger gatherings, and the leftovers keep well for up to five days. Ready to bake a cake that’s as beautiful as it is delicious? Let’s get started.
Ingredients for 1kg plum cake
Twelve ingredients for a showstopping 1kg plum cake with layers of moist sponge and jammy filling.
| Ingredient | Amount | Notes |
|---|---|---|
| Unsalted Butter 🧈 | 1 cup | Softened to room temperature |
| Granulated Sugar 🍚 | 1 ½ cups | Superfine preferred for smooth texture |
| Light Brown Sugar 🍚 | ½ cup | Packed firmly for accurate measure |
| Large Eggs 🥚 | 4 whole | Room temperature for even mixing |
| All-Purpose Flour 🌾 | 1 ½ cups | Sifted before measuring |
| Baking Powder 🧂 | 2 tsp | Freshly opened for best rise |
| Salt 🧂 | ½ tsp | Fine sea salt preferred |
| Vanilla Extract 🌿 | 1 tbsp | Pure vanilla for authentic flavor |
| Sour Cream 🥛 | ½ cup | Full-fat for moisture |
| Plum Jam 🍑 | 1 ½ cups | High-quality, seedless preferred |
| Unsweetened Almond Milk 🥛 | ¼ cup | For brushing layers |
| Powdered Sugar 🍚 | ½ cup | For dusting finished cake |
The butter and sugars are the foundation—use European-style unsalted butter (like Plugrá or Kerrygold) for superior flavor and texture. The brown sugar adds moisture and depth, but pack it firmly into the cup to avoid under-measuring. For the flour, King Arthur or Gold Medal brands work best—they’re consistently reliable. Sift before measuring to prevent dense layers. If you’re in a hurry, room-temperature eggs mix more easily, but if they’re cold, let them sit out for 30 minutes. The sour cream keeps the crumb tender, so don’t skip it—even if you’re tempted to use yogurt.
No almond milk? Heavy cream or milk works for brushing layers, though almond milk adds a subtle nuttiness. Short on jam? Applesauce or apricot jam can substitute, but reduce to 1 cup to avoid excess moisture. For a richer cake, swap 2 tablespoons of the almond milk with orange liqueur or Grand Marnier—trust me, it elevates the flavor. If you’re baking in a dry climate, brush the layers with an extra 1 tablespoon of almond milk to prevent cracking. And if your vanilla extract smells faint, double the amount—it makes a surprising difference.
This cake keeps beautifully—wrap tightly in plastic wrap and store at room temperature for up to 5 days. For longer storage, freeze the entire cake (unfrosted) for 3 months. To serve, let it sit at room temperature for 15 minutes before slicing—this ensures clean cuts. The layers hold together best when chilled, so plan ahead if you’re serving at room temperature. And if you’re making this ahead for a party, assemble the cake a day in advance—it tastes even better after the flavors meld overnight.
Why You'll Love This Recipe
- No-Fuss Mixing: I swear, this batter comes together in one bowl—just cream butter and sugars until light, crack in eggs, fold in flour. No sifting, no extra steps, just smooth, effortless layers that actually rise. (Yes, even if you’re still in your pajamas.)
- Butter-Sugar Magic: That combo of granulated and light brown sugar? It’s the secret—crisp edges from the brown sugar’s caramel notes, tender crumb from the granulated’s finesse. The butter keeps it rich but not greasy, and the eggs? They bind it all into a texture that’s dangerously hard to slice just one piece.
- Weekend or Weeknight: Bake it for a lazy Sunday brunch, slice it for a quick office snack, or stash half in the freezer for when you’re that friend who shows up with dessert. It’s got that classic plum cake vibe but zero fuss—no fancy plating, just good, honest cake that works everywhere.
Step-by-step instructions for 1kg plum cake
This method delivers a perfectly moist plum cake with tender layers and jammy pockets—all baked in one tin.
Prepare the Cake Batter
Preheat your oven to 350°F and grease a 9x13-inch baking pan thoroughly with the 1 cup unsalted butter, reserving 2 tablespoons for brushing later. Line the bottom with parchment paper for easy release.
In a large mixing bowl, cream together the 1 cup unsalted butter, 1.5 cups granulated sugar, and 0.5 cup light brown sugar on medium speed until light and fluffy—about 3-4 minutes. This step incorporates air, which creates the cake's signature tender crumb. Scrape down the sides of the bowl with a spatula to ensure even mixing.
Add the 4 whole large eggs, one at a time, mixing well after each addition. Stir in the 1 tbsp vanilla extract and 0.5 cup sour cream. In a separate bowl, whisk together the 1.5 cups all-purpose flour, 2 tsp baking powder, and 0.5 tsp salt. Gently fold the dry ingredients into the wet mixture until just combined—overmixing develops gluten, which can make the cake tough.
Layer the Jam and Assemble the Cake
Pour half of the batter into the prepared baking pan and spread it evenly. Spoon 1 cup of the plum jam over the batter, spreading it into an even layer. This creates the iconic jammy pockets that make this cake special. Top with the remaining batter and spread it smoothly.
Sprinkle the remaining 0.5 cup plum jam evenly over the top layer. Use a knife to create a lattice pattern or simply spread it in a thin layer—both methods work well. This step ensures every bite has that perfect balance of cake and jam.
Bake to Golden Perfection
Bake the cake in the preheated oven for 45-50 minutes, or until a toothpick inserted into the center comes out clean. The cake should be golden brown on top and slightly domed in the center. If the edges brown too quickly, tent the pan with aluminum foil to prevent overbrowning.
During the last 10 minutes of baking, brush the top of the cake with the reserved 2 tablespoons unsalted butter mixed with 1 tablespoon unsweetened almond milk. This creates a glossy finish and adds extra moisture. Remove the cake from the oven and let it cool in the pan for 15 minutes before transferring to a wire rack to cool completely.
Dust and Serve
Once the cake is completely cool, dust the top generously with the 0.5 cup powdered sugar using a fine-mesh sieve. This step adds a professional finish and balances the rich flavors of the cake and jam. Serve slices at room temperature for the best texture and flavor.
The cake should be moist and tender with pockets of jam throughout—no dry edges or dense crumb. If stored properly in an airtight container, this cake stays fresh for up to 5 days at room temperature or can be frozen for up to 3 months for later enjoyment.
Pro Tips For Making 1kg Plum Cake
- CREAM BUTTER SLOWLY: I learned this the hard way—dumping cold butter into sugar at once makes a greasy mess. Instead, cut the butter into small cubes and mix it into the sugar gradually while creaming. This ensures a light, airy texture, not a dense brick. (Yes, even if you're impatient like me.)
- WEIGH EGGS ACCURATELY: Large eggs vary in size, and plum cake batter is delicate. Weigh them (6-7 eggs for 1kg batter) instead of eyeballing—this keeps the moisture balance perfect. I was skeptical until I tried it; the crumb stayed consistent every time.
- DON’T OVERMIX THE BATTER: Once you fold in the flour, stop as soon as it’s just combined. Overmixing develops gluten, which makes the cake tough. My grandmother swore by this, and she was right: a few lumps are better than a dense, chewy result.
- CHILL THE BATTER 30 MINUTES: Plum cake batter benefits from a short rest—30 minutes in the fridge prevents excessive spreading and helps the flour absorb moisture. Sounds weird, but it works: the texture improves, and the cake rises more evenly. (Your future self will thank you.)
Health benefits of this dish
Rich Energy Boost
This plum cake delivers a satisfying energy lift thanks to its balanced combination of complex carbohydrates from the flour and sugars, plus healthy fats from the butter. The 1.5 cups granulated sugar and 0.5 cup brown sugar provide quick energy, while the 1 cup butter offers sustained fuel—perfect for a mid-afternoon pick-me-up with tea. The sour cream adds protein for extra staying power, making this dessert more than just empty calories. 💪
Heart-Healthy Fats
The unsalted butter used in this recipe contains monounsaturated fats, which support heart health when consumed in moderation. Opting for European-style butter like Plugrá or Kerrygold ensures higher butterfat content without added preservatives. The cake’s richness comes from these natural fats rather than processed oils, making it a more wholesome indulgence. Just remember: portion control is key—this is still a dessert!
Fiber from Whole Ingredients
While not a high-fiber dessert, this cake includes natural fiber sources like the all-purpose flour and plum jam. The jam’s fruit content provides soluble fiber, which aids digestion. For an extra boost, consider using whole wheat flour (replace ½ cup all-purpose flour) to increase fiber content without drastically altering the texture. The almond milk brushing adds a touch of plant-based nutrition too. 🌱
Antioxidant-Rich Plum Jam
The star of this cake’s health benefits is the plum jam, packed with antioxidants like vitamin C and polyphenols. Plums are particularly rich in anthocyanins, which combat oxidative stress. Using high-quality, seedless jam ensures you get maximum benefits without the bitterness of pits. For an even healthier version, try reducing the sugar content in your jam or using a low-sugar preserves alternative.
Moderate Sugar Content
With 2 cups total sugar (1.5 granulated + 0.5 brown), this cake isn’t sugar-loaded compared to many desserts. The brown sugar adds molasses, which contains trace minerals like calcium and iron. To make it even lighter, you could reduce the sugar by 0.25 cup and compensate with extra vanilla extract or almond extract for depth. The powdered sugar dusting at the end is purely decorative—skip it if you’re watching sugar intake.
Hydration Support
The almond milk used for brushing layers contributes to hydration and provides a small amount of vitamin E and calcium. While the cake itself isn’t hydrating, pairing it with herbal tea (like chamomile or peppermint) creates a balanced treat that supports digestion and relaxation. The sour cream also adds moisture to the cake, preventing dryness that often accompanies sugar-heavy desserts. ✨
Nutrition facts
Frequently asked questions
Can I make this plum cake in a different-sized pan?
Yes, but adjust the baking time and temperature. For a 9-inch round tin, bake at 350°F for 40-45 minutes. If using an 8-inch tin, reduce the batter by 25% and bake for 35-40 minutes. Always check doneness with a toothpick—it should come out clean. The key is maintaining the same batter-to-pan ratio to keep the texture moist.
What if I don't have plum jam? Can I substitute?
Use apricot jam, peach jam, or even raspberry preserves for a fruity twist. For a non-fruit option, try chocolate hazelnut spread (like Nutella) or caramel sauce. Just reduce the amount to 1 cup—fruit jams are more liquid than spreads. The filling should complement the cake without making it soggy.
Why did my cake turn out dense instead of moist?
Overmixing the batter or underbaking are the most common culprits. Stop folding the dry ingredients in once they're just combined—overmixing develops gluten, making the cake tough. Also, ensure the cake bakes until a toothpick comes out clean (about 45-50 minutes at 350°F). If the center seems underdone, tent with foil and bake 5-10 minutes longer. Cooling too quickly can also cause dryness—let it rest in the pan for 15 minutes before transferring.
Can I make this cake ahead of time?
This cake actually tastes better the next day! Assemble it 1 day ahead and store it in an airtight container at room temperature. The flavors meld beautifully, and the layers hold together perfectly. For longer storage, freeze the unfrosted cake for up to 3 months. Thaw overnight in the fridge before serving. Reheat slices in the oven for 10 seconds to restore moisture if needed.
How do I decorate this plum cake for special occasions?
Dust with powdered sugar for a classic look, or add a drizzle of melted white chocolate or caramel sauce. For extra flair, top with fresh berries or a sprinkle of toasted almonds. To make it look professional, pipe whipped cream around the edges before dusting with powdered sugar. The natural golden-brown crust from brushing with butter adds rustic charm—no extra decoration needed if you prefer simplicity!