My Lemon Blueberry Crumb Cake features a tender vanilla butter cake base topped with a thick layer of juicy, lemon-bright blueberries and a buttery brown sugar crumb. The cake batter is a simple, one-bowl mash-up you can mix by hand, so this is an easy and satisfying summer brunch or dessert. This recipe works with fresh or frozen blueberries and yields a moist, tender cake with a jammy fruit layer and crisp crumbs on top. If you enjoy fruity crumb cakes, try my other fruit cakes and loaves for more inspiration.
WHY YOU WILL LOVE THIS RECIPE:
- Soft, tender butter cake – a simple melt-and-mix method creates a light, delicate crumb without complicated techniques.
- Easy to make – despite having three components (cake, blueberry layer, and crumb), everything comes together quickly and can be mixed by hand.
- Juicy blueberry layer – sweetened blueberries are tossed with a little flour and lemon, then spooned over the batter to form a thick, jammy filling during baking.
- Buttery crumb topping – just flour, sugar, and melted butter combined into clumps and sprinkled over the berries for a crisp, caramelized finish.
- Lemon-blueberry balance – a little lemon juice brightens the naturally sweet blueberries and lifts the overall flavor.
- Optional glaze – combine reserved blueberry juices with powdered sugar and a squeeze of lemon for a vivid, lightly tart glaze to drizzle over the cooled cake.
INGREDIENTS
- All-purpose flour – use unbleached all-purpose for a tender crumb; avoid cake flour here.
- Unsalted butter – this recipe uses butter in both the batter and the crumb; the cake stays surprisingly light with moderate butter in the batter.
- Granulated and brown sugar – granulated for the cake keeps it light, and a touch of brown sugar adds caramel notes to the crumb.
- Eggs – two large eggs provide structure while keeping the cake tender.
- Pure vanilla extract – vanilla is essential to complement the lemon and blueberry flavors.
- Sour cream – full-fat sour cream adds richness and keeps the cake moist; Greek yogurt or crème fraîche can be used as substitutes.
- Blueberries – fresh or frozen will work. Fresh berries give the lightest texture; frozen berries may require slightly longer baking to cook off extra moisture.
- Milk – room-temperature whole milk is preferred, but any milk works.
- Lemon juice – essential for balancing the sweetness of the blueberries; a little goes a long way to brighten flavor.
STEP BY STEP INSTRUCTIONS
- Step 1 — Make the crumb topping. Combine the flour, granulated sugar, brown sugar, and a pinch of salt (if using unsalted butter) in a bowl. Stir in melted butter and toss with your fingertips to form large clumps. Cover and set aside.
- Step 2 — Prepare the cake batter. Melt the butter and let it cool slightly. Whisk the melted butter with both sugars, vanilla, and lemon zest until pale and slightly fluffy. Add eggs one at a time, whisking between additions, then stir in the sour cream.
- Step 3 — Combine dry ingredients. In a separate bowl, sift or whisk together the flour, baking powder, and salt. Fold the dry ingredients into the wet mixture until mostly combined.
- Step 4 — Add milk and fill the pan. Fold in the milk until the batter is even, then spread it into a prepared 8×8-inch pan lined with parchment paper, leaving an overhang for easy removal.
- Step 5 — Make the blueberry layer. Toss the blueberries with a tablespoon or so of flour, the sugar, and a squeeze of lemon. Spread the berries evenly over the batter.
- Step 6 — Top with crumbs and bake. Scatter the crumb clumps evenly over the blueberries. Bake at 350°F (175°C) for about 40–50 minutes, until the crumbs are golden and the cake feels firm. If using frozen berries, expect baking to take toward the longer end of that range.
- Step 7 — Cool and glaze (optional). Cool the cake on a wire rack at least 30 minutes. For a glaze, mix reserved blueberry juices (or a little thawed berry juice) with powdered sugar and lemon juice to a drizzling consistency and pour over the warm cake.
EXPERT BAKING TIPS FOR LEMON BLUEBERRY CRUMB CAKE
- Use room temperature ingredients. This ensures even mixing and a smooth batter, especially important with the melt-and-mix method.
- Sift or whisk dry ingredients. Doing so reduces the need to over-mix and yields a finer crumb texture.
- Don’t over-mix. Fold until combined; a few streaks of flour are fine before you add the milk to finish mixing.
- Prefer salted butter for the crumb. Salted butter enhances the topping’s flavor; if using unsalted, add a pinch of salt to the crumbs.
- Don’t skip the lemon. Blueberries benefit from acidity—lemon juice brightens and balances the sweetness.
RECIPE FAQ
Yes. Bake and cool fully, then cover and refrigerate. Because of the moist blueberry layer, refrigeration is recommended if storing more than a day. Reheat gently to serve warm.
They are similar. Coffee cake often includes sour cream and is denser; this crumb cake uses sour cream and milk together for a lighter, softer texture.
Proper balance of eggs, flour, and fat creates a tender yet stable crumb. Avoid over-measuring flour to prevent dryness.
Dense or gummy cake can result from too much flour (pack your measuring cups lightly or weigh ingredients), under-baking, or expired leavening. The wet fruit topping also requires longer baking time than a plain cake.
Too much flour or not enough sugar/liquid leads to dryness. Accurate measuring and correct liquid-to-dry ratios are key.
Full-fat Greek yogurt or crème fraîche are good substitutes and will keep the cake moist and rich.
Both work. Fresh berries make the fluffiest cake. If using frozen berries, remove them from the freezer about 20 minutes before using to take the chill off, and bake a bit longer to evaporate extra moisture. If berries are icy, rinse briefly under cold water to remove surface ice and drain well; don’t let them fully thaw.
Yes — a 9-inch round pan will work with similar baking time. An 8-inch pan will yield a thicker cake and may require adjustments; fresh berries are recommended in smaller pans to avoid extended baking time.
STORAGE AND SERVING
How to store blueberry crumb cake?
Store in an airtight container at room temperature for up to 1 day, then refrigerate for up to 5 days. Bring to room temperature or warm slightly before serving for best texture.
How to serve blueberry crumb cake?
Serve warm or at room temperature. It’s delicious plain, or serve with lightly sweetened whipped cream or vanilla ice cream for a more decadent presentation.
RELATED RECIPES
If you love baking with blueberries and citrus, consider trying other fruit-forward cakes, muffins, and loaves for more seasonal baking ideas.
- Lemon Blueberry Cookies
- Lemon Blueberry Sweet Rolls
- The BEST Blueberry Pie
- The BEST Blueberry Muffins
If you love cake and fruit, try other crumb cakes and fruit cakes for variety.
RECIPE: LEMON BLUEBERRY CRUMB CAKE
Servings: 9 • Prep Time: 10 mins • Cook Time: 45 mins
For the crumb topping:
- ¾ cup (105g) all-purpose flour
- 2 tbsp (25g) granulated sugar
- 3 tbsp (45g) packed light brown sugar
- 5 tbsp (70g) salted butter, melted (or add a pinch of salt if using unsalted)
For the cake batter:
- 6 tbsp (84g) unsalted butter, melted
- ½ cup (100g) granulated sugar
- ¼ cup (55g) packed light brown sugar
- 1 tsp (5ml) pure vanilla extract
- Zest of one lemon
- 2 large eggs, at room temperature
- ⅓ cup (80ml) sour cream
- 1 ⅓ cups (190g) all-purpose flour
- 1 ½ tsp baking powder
- ¼ tsp salt
- ⅓ cup (80ml) milk, room temperature
For the blueberries:
- 2 ¼ cups (300g) fresh or frozen blueberries
- 1 ½ tbsp (14g) all-purpose flour
- 1 ½ tbsp (18g) granulated sugar
- A squeeze of lemon juice
Baking notes
Preheat oven to 350°F (175°C). Line an 8×8-inch square pan with parchment paper leaving a 2-inch overhang for easy removal. Follow the step-by-step instructions above for mixing, layering, and baking. When baked, allow the cake to cool before glazing or slicing. Enjoy this vibrant lemon-blueberry cake as a brunch centerpiece or an easy summer dessert.