Quick Recipe Version (TL;DR)

Yield: 10–12 slices
Prep Time: 25 minutes
Cook Time: 40 minutes
Total Time: 1 hour 5 minutes

Quick Ingredients

150 g (2/3 cup) unsalted butter, softened
130 g (2/3 cup) sugar + 2 tbsp for berries
1 tsp vanilla extract
3 large eggs, room temperature
325 g (2 2/3 cups) all-purpose flour, divided
1 1/2 tsp baking powder + 1/4 tsp fine salt
60 ml (1/4 cup) milk, room temperature
500 g (about 4 cups) fresh or frozen blueberries
1 tbsp lemon juice
1 tbsp cornstarch
80 g (about 6 tbsp) cold unsalted butter for streusel
75 g (6 tbsp) sugar for streusel
Powdered sugar, to dust (optional)

Do This

1. Preheat oven to 180°C / 350°F. Butter and line a 26 cm (10 inch) springform pan.
2. Make streusel: mix 125 g flour, 75 g sugar, pinch salt, 1 tsp vanilla; rub in 80 g cold butter to coarse crumbs. Chill.
3. Toss blueberries with 2 tbsp sugar, 1 tbsp cornstarch, and 1 tbsp lemon juice. Set aside.
4. Beat 150 g butter, 130 g sugar, and 1 tsp vanilla until fluffy. Beat in 3 eggs one at a time.
5. Fold in 200 g flour, 1 1/2 tsp baking powder, 1/4 tsp salt, and 60 ml milk to make a thick batter.
6. Spread batter in pan, scatter blueberries over, then sprinkle streusel evenly on top.
7. Bake about 40 minutes until golden and a tester comes out clean in the center. Cool, dust with powdered sugar, slice, and serve.

Why You’ll Love This Recipe

Classic German-style blueberry cake: a tender vanilla sponge, juicy berries, and crisp buttery streusel.
Works with fresh or frozen blueberries, including small wild berries for extra flavor.
Simple, everyday ingredients you probably already have in your pantry.
Perfect for coffee time, brunch, or an easy dessert that feels special but is very doable.

Grocery List

Produce: 500 g blueberries (fresh or frozen), 1 lemon
Dairy: Unsalted butter, eggs, milk, whipping cream (optional, for serving)
Pantry: All-purpose flour, granulated sugar, powdered sugar, vanilla extract, baking powder, cornstarch, fine salt

Full Ingredients

For the Cake Base (Sponge)

150 g unsalted butter, softened (2/3 cup or 10 1/2 tbsp)
130 g granulated sugar (2/3 cup)
1 tsp vanilla extract
3 large eggs, at room temperature
200 g all-purpose flour (about 1 2/3 cups, spooned and leveled)
1 1/2 tsp baking powder
1/4 tsp fine salt
60 ml milk, at room temperature (1/4 cup; whole milk preferred)

For the Blueberry Layer

500 g blueberries (about 4 cups; wild or cultivated, fresh or frozen)
2 tbsp granulated sugar
1 tbsp lemon juice (about 1/2 lemon)
1 tbsp cornstarch (cornflour)

For the Streusel Topping

125 g all-purpose flour (1 cup, spooned and leveled)
75 g granulated sugar (6 tbsp; you can swap half for light brown sugar)
1 tsp vanilla extract (or 1 packet vanilla sugar, 8 g)
Pinch of fine salt
80 g unsalted butter, very cold and cubed (about 6 tbsp)

For Finishing

Powdered sugar, for dusting (optional)
Lightly sweetened whipped cream, for serving (optional but very traditional)

Step-by-Step Instructions

Step 1: Prepare the pan and preheat the oven

Preheat your oven to 180°C / 350°F, with a rack in the middle position.

Butter a 26 cm (10 inch) springform pan. For easier removal, line the bottom with a circle of parchment paper, then butter the paper as well. Lightly dust the sides with flour and tap out any excess. Set the pan aside.

Step 2: Make the streusel topping

In a medium bowl, combine 125 g flour, 75 g sugar, a pinch of salt, and 1 tsp vanilla extract (or vanilla sugar). Stir to distribute the vanilla and salt evenly.

Add the 80 g cold, cubed butter. Using your fingertips, rub the butter into the dry ingredients until coarse crumbs form. You want some fine crumbs and some larger clumps about the size of peas for good texture. Place the bowl in the refrigerator while you prepare the rest of the cake so the streusel stays cold and bakes up crisp.

Step 3: Toss the blueberries

If using frozen blueberries, do not thaw them first. Place the blueberries in a medium bowl. Add 2 tbsp sugar, 1 tbsp lemon juice, and 1 tbsp cornstarch.

Gently toss until the berries are evenly coated. The cornstarch will lightly thicken the juices as the cake bakes, so they soak into the sponge instead of making it soggy.

Step 4: Cream butter, sugar, and eggs for the sponge

In a large mixing bowl, beat 150 g softened butter and 130 g sugar together with an electric mixer on medium-high speed for 3–4 minutes, until very light and fluffy. Scrape down the sides of the bowl once or twice so everything is well incorporated.

Add 1 tsp vanilla extract and beat briefly. Then add the eggs one at a time, beating well after each addition. The mixture should be creamy and slightly thick. If it looks a bit curdled, do not worry; it will smooth out when you add the dry ingredients.

Step 5: Add dry ingredients and milk

In a separate bowl, whisk together 200 g flour, 1 1/2 tsp baking powder, and 1/4 tsp fine salt.

Add half of the dry mixture to the butter-egg mixture and mix on low speed just until combined. Add all of the milk and mix again briefly. Finish with the remaining dry ingredients, mixing only until no streaks of flour remain. The batter will be fairly thick but spreadable. Avoid overmixing so the cake stays soft and tender.

Step 6: Assemble the cake layers

Scrape the batter into the prepared springform pan. Use an offset spatula or the back of a spoon to spread it into an even layer, making it slightly higher around the edges and a bit thinner in the center. This helps the cake bake level.

Scatter the prepared blueberries evenly over the batter, leaving a small margin (about 1 cm / 1/2 inch) around the edge so the juices do not leak too much against the pan. Retrieve the chilled streusel from the fridge and sprinkle it evenly over the blueberries, squeezing some of it into larger clumps as you go.

Step 7: Bake the Heidelbeerkuchen

Place the pan in the preheated oven and bake for about 38–42 minutes. The streusel should be golden, the blueberries bubbling gently, and a toothpick inserted in the center of the cake (avoiding a blueberry pocket) should come out clean or with just a few moist crumbs.

If the top is browning too quickly toward the end of baking, loosely tent the cake with a piece of foil and continue baking until done.

Step 8: Cool, finish, and serve

Transfer the baked cake to a wire rack and let it cool in the pan for at least 20–30 minutes. Carefully run a thin knife around the edge, then release and remove the springform ring.

Serve the cake slightly warm or at room temperature. Just before serving, dust lightly with powdered sugar, if you like. Cut into 10–12 wedges. This cake is especially lovely with a spoonful of softly whipped cream on the side.

Pro Tips

Room temperature ingredients: For the fluffiest sponge, make sure your butter, eggs, and milk are at room temperature so they blend smoothly and trap more air.
Do not overmix the batter: Once you add the flour, mix only until the streaks disappear. Overmixing can make the cake dense and tough.
Use wild blueberries if possible: Small wild berries give a more intense flavor and more even distribution throughout the cake, but cultivated blueberries work very well too.
Frozen berries need no thawing: Bake straight from frozen. If the center seems a little underdone at 40 minutes, give the cake a few extra minutes in the oven.
Check doneness correctly: Insert the tester into a spot with mostly cake (not directly into a juicy blueberry pocket), or gently lift the streusel to test the sponge beneath.

Variations

Rustic sheet cake: Double all ingredients and bake in a standard rimmed baking sheet (about 30 × 40 cm / 12 × 16 inches) for 30–35 minutes. Great for parties or potlucks.
Almond streusel twist: Replace 40 g (1/3 cup) of the streusel flour with ground almonds and scatter a small handful of sliced almonds over the top before baking.
Lemon-glazed version: Skip the powdered sugar dusting and instead drizzle the cooled cake with a simple glaze made from 80 g (2/3 cup) powdered sugar and 1–2 tbsp lemon juice.

Storage & Make-Ahead

Once completely cooled, cover the cake loosely and store at room temperature for up to 1 day. For longer storage (up to 3 days), keep it covered in the refrigerator; let slices come back toward room temperature before serving for the best texture.

The cake also freezes very well. Wrap individual slices tightly in plastic wrap, then place in an airtight container or freezer bag and freeze for up to 2 months. Thaw at room temperature for 1–2 hours, or gently warm in a low oven (about 140°C / 285°F) for 10–15 minutes to refresh the crumb.

Nutrition (per serving)

Approximate values per slice (1/12 of the cake): about 390 kcal; 5 g protein; 20 g fat; 48 g carbohydrates; 2 g fiber; 26 g sugars. Values will vary slightly depending on the exact size of your slices and the type of blueberries used.

Heidelbeerkuchen: Rustic German Blueberry Streusel Cake