This wild blueberry crumb cake balances a tender, buttery cake with a sweet cinnamon streusel. Each slice offers juicy bursts of blueberry, warm spice, and a soft, fine crumb that stays moist for days. The recipe is simple enough for everyday baking yet special enough for brunch or an easy dessert.
Serve it warm with coffee for breakfast, cut squares for a potluck, or pair it with whipped cream or ice cream for dessert. You can substitute different berries, add citrus zest, or bake the batter as muffins or a loaf—these changes won’t alter the cake’s character. It’s adaptable, reliable, and consistently crowd-pleasing.
What You’ll Like About This Recipe
Tender, bakery-style crumb. The buttermilk keeps the cake delicate and moist, producing a fine crumb similar to a bakery coffee cake but with an easy home-baking method.
Wild blueberries throughout. Wild blueberries are smaller and more flavorful, so they disperse evenly and give concentrated bursts in every bite. Regular blueberries work well too; if using frozen, keep them frozen and toss with a little flour to minimize streaking.
Sweet cinnamon streusel. The buttery crumb topping forms sandy clusters that melt slightly into the surface as the cake bakes, adding crunch and caramel notes without becoming a loose pile of crumbs.
Breakfast or dessert. Because it’s not overly sweet, the cake works for breakfast, brunch, or as a simple dessert with coffee, tea, or milk.
Easy to adapt. Swap berries, add zest, change spices, or bake as muffins or a loaf. The base is flexible and forgiving, making it a reliable recipe year-round.
Ingredient Notes
- Blueberries – Fresh wild blueberries are ideal because their small size prevents sinking and concentrates flavor. Regular fresh berries are fine; with frozen, keep them unthawed and toss with a little flour.
- Buttermilk – Adds acidity that tenderizes the crumb and keeps the cake moist. If you don’t have buttermilk, mix milk with a tablespoon of lemon juice or vinegar and let it sit briefly.
- All-purpose flour – Provides structure for the cake and topping. Measure by weight or spoon into the cup to avoid packing and a dry cake.
- Brown sugar – Adds depth and a caramel note to the topping. Light or dark brown sugar work; dark brown will deepen the flavor.
- Butter – Softened butter is important for creaming to introduce air and achieve a fluffy cake. Room-temperature butter mixes easily into the crumb topping for the right texture.
How to Make It
- Prep a 9-inch square pan by greasing and flouring it, and preheat the oven to 375°F. Have ingredients measured and butter softened so the batter comes together smoothly.
- Cream the butter and sugar until pale and fluffy, about 3 minutes. Add the egg and vanilla and mix until combined.
- Whisk the flour, baking powder, baking soda, and salt. Add the dry mixture to the butter mixture in stages, alternating with the buttermilk, to keep the batter smooth. Stop mixing as soon as the dry ingredients are incorporated.
- Gently fold in the blueberries with a spatula to avoid crushing them and streaking the batter.
- Spread the batter evenly in the prepared pan using the back of a spoon or an offset spatula.
- For the crumb topping, combine butter, brown sugar, flour, and cinnamon with a fork or your fingers until large sandy crumbs form. Scatter the topping evenly over the batter.
- Bake 25–35 minutes, until the cake springs back lightly and a toothpick inserted in the center comes out clean. Let cool before slicing to set the crumb.
Pro Tips
- Cream the butter until it’s noticeably lighter in color and volume. Proper creaming traps air that helps the cake rise and yields a tender crumb.
- Avoid overmixing after adding flour; stop when the dry ingredients are just incorporated to prevent a dense texture.
- Use wild blueberries when possible for even distribution. For larger berries, toss with a teaspoon of flour so they stay suspended in the batter.
- Leave the crumb topping loose rather than pressing it into the batter so it bakes into distinct clusters.
- Begin checking for doneness a few minutes before the minimum bake time—moist cakes can brown quickly if an oven runs hot.
Recipe Variations
- Frozen blueberries. Toss frozen berries with 1 tablespoon flour (do not thaw) before folding in.
- Citrus zest. Add lemon or orange zest to brighten the flavor.
- Other berries. Use raspberries, chopped strawberries, or a mixed berry blend.
- Dried fruit. Stir in chopped dried cranberries, cherries, or apricots for chew and tartness.
- Nuts. Add chopped pecans or walnuts to the topping for extra crunch.
- Spice swaps. Replace cinnamon with cardamom or a pinch of nutmeg for a different profile.
- Muffins. Bake the batter in lined muffin tins at 375°F for about 18–22 minutes.
- Loaf. Bake in a greased loaf pan at 350°F for 50–60 minutes, tenting with foil if the topping browns too fast.
Serving Suggestions
- Serve warm or at room temperature for breakfast, brunch, or dessert.
- Pair with coffee, tea, or a cold glass of milk.
- Dress it up with vanilla ice cream, whipped cream, or a drizzle of caramel sauce.
- Add extra berries on the side for freshness.
- Leftovers make a quick parfait layered with yogurt or whipped cream.
How to Store
Room temperature: Keep the cake covered for up to 2 days to prevent drying. Refrigerator: Store in an airtight container for up to 5 days. Freezer: Wrap individual slices tightly and freeze up to 2 months. Label with the date.
Refresh: Warm slices briefly in the microwave or in a low oven until the crumb softens; avoid overheating so the streusel remains intact.
Frequently Asked Questions
Yes. Regular blueberries work fine, though wild blueberries tend to distribute more evenly and offer more concentrated flavor.
Wild berries sink less. For larger berries, gently toss them with a teaspoon of flour to help suspend them in the batter.
You can reduce the cake sugar by a tablespoon or two without affecting structure. Cutting sugar in the crumb topping too much will change its texture.
Blueberry Crumb Cake
Diana Rattray
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Ingredients
- Butter and flour, for the pan
- 5 tbsp unsalted butter, softened
- ¾ cup granulated sugar
- 1 large egg
- 1 tsp vanilla extract, or vanilla bean extract
- 2 cups (255 grams ) all-purpose flour
- 1 ½ tsp baking powder
- ¼ tsp baking soda
- ½ tsp salt
- ½ cup buttermilk
- 2 cups blueberries
For the Crumb Topping
- 4 tbsp butter, room temperature
- ½ cup brown sugar, packed
- ⅓ cup all-purpose flour
- ½ tsp ground cinnamon
Recommended Equipment
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Electric hand mixer or stand mixer
Instructions
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Position a rack in the center of the oven and preheat to 375°F. Grease and flour a 9-inch square pan.
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Beat the butter and sugar with a mixer until light and fluffy, about 3 minutes. Add the egg and vanilla and beat until blended.
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Whisk flour, baking powder, baking soda, and salt together. Add about one-third of the dry mix to the butter mixture with half the buttermilk, beat until smooth. Repeat with another third and the remaining buttermilk, then add the last third and beat just until combined. Fold in the blueberries.
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Spoon the batter into the prepared pan and spread gently.
Make the Topping
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Combine butter, brown sugar, flour, and cinnamon; mix with a fork or your fingers until crumbly. Sprinkle evenly over the batter.
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Bake 25 to 35 minutes, until the cake springs back when touched and a toothpick comes out clean from the center.
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Allow the cake to cool, slice, and serve with extra berries or a scoop of ice cream.
Nutrition
Disclaimer:
Nutritional information is an estimate from a third-party tool and may vary by ingredient brands, measurements, and serving sizes.