One-Bowl Blueberry Muffin Cake
This blueberry muffin cake tastes like your favorite bakery muffin, but it’s baked in one pan and comes together in a single bowl.
Tender, buttery, and loaded with jammy berries, it needs no mixer and no weird ingredients, just a big spoon and 15 minutes of hands-on time.
Why This Blueberry Muffin Cake Works
The crumb hits that sweet spot where a muffin meets a cake: dense enough to feel substantial, but still soft and moist, thanks to buttermilk and melted butter. A generous sprinkle of sugar on top bakes into a thin, crackly crust that gives you that classic domed muffin top feeling, only in slab form.
It also stays fresh for a couple of days, which means you can slice off squares all weekend and they’ll still taste like they came straight from the oven.
Ingredients
- 2 cups (250g) all-purpose flour: spooned and leveled, not scooped.
- 3/4 cup (150g) granulated sugar: plus more for topping.
- 2 tsp baking powder: check the date so it’s active.
- 1/2 tsp fine sea salt: brings out the blueberry flavor.
- 1 cup (240ml) buttermilk: full-fat if you can, the tang keeps it tender.
- 1/2 cup (113g) unsalted butter: melted and cooled slightly.
- 1 large egg: at room temperature for easier mixing.
- 1 tsp vanilla extract: the real stuff, not imitation.
- 1 1/2 cups (225g) fresh blueberries: washed and patted dry; frozen work too.
Variations / Substitutions
- Swap the fruit: raspberries or blackberries work just as well; keep the berry size uniform.
- Lemon upgrade: stir 1 tablespoon of fresh lemon zest into the wet mix for a bright, sunny flavor.
- No buttermilk?: use 1 cup whole milk with 1 tablespoon lemon juice; let it sit 5 minutes before using.
- Make it gluten-free: swap in a 1-to-1 gluten-free flour blend that contains xanthan gum.
- Go nutty: fold in 1/3 cup chopped toasted pecans or walnuts along with the berries.
If you love this, you’ll also dig my ultra-moist lemon poppy seed loaf.
How to Make Blueberry Muffin Cake
Step 1: Whisk the Dry Ingredients
Set a rack in the middle of your oven and preheat it to 375°F (190°C). Grease a 9-inch round cake pan, then dust it lightly with flour and tap out the extra.
In a large bowl, whisk together the 2 cups flour, 3/4 cup sugar, 2 teaspoons baking powder, and 1/2 teaspoon salt. You’re just breaking up any clumps so the leavening disperses evenly.
The mixture will look pale and fluffy, with tiny white specks of baking powder throughout. You should not feel any gritty lumps if you rub a pinch between your fingers.
Step 2: Stir in the Wet Ingredients
Pour the 1 cup buttermilk, cooled melted butter, egg, and 1 teaspoon vanilla right into the dry mix. Stir with a wooden spoon just until no streaks of flour remain, about 25 to 30 strokes.
The batter will be thick and glossy, on the edge of lumpy. That’s exactly how it should look; if you keep mixing until it’s silky smooth, the cake will turn out tough.
A few small flour pockets are fine. They’ll hydrate as the batter rests while you add the berries.
Step 3: Fold in the Blueberries
Tip the 1 1/2 cups blueberries into the bowl. Use a flexible spatula to fold them in with broad, gentle strokes, turning the batter over until the berries are distributed without breaking too many.
You might see a faint purple ribbon here and there. That’s a sign you’re not overworking the batter, and it will give you those pretty, whole-berry pockets inside the finished cake.
Step 4: Scrape into the Pan
Scoop the batter into the prepared pan and spread it into an even layer with your spatula, pushing it gently to the edges. The top will look bumpy from the berries and a little messy, and that’s fine.
Sprinkle the entire surface with 1 1/2 to 2 tablespoons of extra granulated sugar. Do this generously, because that thin sugar layer is what crackles into the crust.
Step 5: Bake until Golden and Crackly
Slide the pan into the oven and bake for 30 to 35 minutes. Start checking at 30 minutes: the top should be deeply golden, the edges pulling away slightly from the pan, and a toothpick inserted in the center should come out with a few moist crumbs but no wet batter.
As it bakes, your kitchen will smell like butter and warm berries, and the sugar on top will form a thin, glassy crust. Do not open the door before the 26-minute mark, or the heat drop can sabotage that domed rise.
Step 6: Slice and Serve Warm
Set the pan on a wire rack and let the cake cool for at least 10 minutes. Run a butter knife around the edge, then carefully turn the cake out onto a plate and flip it right side up onto a serving board. Slice into wedges and serve while it’s still warm.
If any blueberries escaped and left juicy spots on the top, just call them character. A pat of salted butter on each slice never hurts.
Tips for the Best Blueberry Muffin Cake
- Don’t overmix: Stir until the flour just disappears. Overworking the batter activates gluten and makes the cake dense and chewy instead of tender.
- Pat berries dry if using frozen: Frozen blueberries work great but toss them with a teaspoon of flour before folding in so they don’t sink and bleed too much.
- Check your baking powder: If it’s been open longer than 6 months, test a pinch in hot water. If it doesn’t fizz vigorously, grab a new can.
- Use the pan you have: This is a flexible batter, so see the table below for different baking dishes.
Bake times by pan size:
| Pan | Material | Bake Time |
|---|---|---|
| 9-inch round | metal | 30 – 35 mins |
| 8-inch square | metal or glass | 28 – 32 mins |
| 9×5-inch loaf | metal | 45 – 50 mins |
Storing Leftovers
- Room temp: Wrap the cooled cake tightly in plastic wrap or keep it in an airtight container for up to 2 days.
- Refrigerator: Store covered for up to 5 days; the crumb will firm up a bit, but a quick 10-second zap in the microwave brings back its softness.
Frequently Asked Questions
Can I make this in a 9×13-inch pan?
Yes. The cake will be thinner, so start checking for doneness around 20 minutes and pull it when the center springs back lightly.
Do I have to add the sugar on top?
No, but you’ll miss that signature crackly muffin top. If you skip it, the crust will be softer and more cake-like.
Can I add a streusel instead?
Absolutely. Mix 3 tablespoons cold butter, 1/4 cup flour, 1/4 cup brown sugar, and a pinch of cinnamon until crumbly, then sprinkle evenly before baking.
Why did my blueberries sink to the bottom?
It’s usually because the batter was too thin or the berries were too heavy with moisture. Tossing the berries in a little flour before folding (even fresh ones) gives them a better grip.
Blueberry Muffin Cake Recipe
Ingredients
Method
- Preheat oven to 375°F (190°C). Grease and flour a 9-inch round cake pan. Whisk flour, sugar, baking powder, and salt in a large bowl.
- Add buttermilk, melted butter, egg, and vanilla. Stir with a wooden spoon just until combined, about 25 strokes; the batter will be thick and lumpy.
- Fold in the blueberries with a spatula using a few gentle strokes.
- Scrape batter into the pan and spread evenly. Sprinkle 1 1/2 to 2 tablespoons granulated sugar over the top.
- Bake 30 to 35 minutes, until golden and a toothpick inserted in the center comes out with moist crumbs.
- Cool in the pan on a rack for 10 minutes, then turn out, slice, and serve warm.
