Buttermilk blueberry breakfast cake is the kind of bake that feels like “just cake” until you taste it—tender, buttery crumbs, bright lemon, and pockets of jammy blueberries. It’s perfect for slow weekend mornings, but it’s also one of those reliable recipes you can pull off on a regular weekday because the batter comes together quickly and bakes in a simple square pan.
Why you’ll love this dish
- Comforting but not heavy: Buttermilk keeps the crumb soft and lightly tangy, balancing the sweetness.
- Blueberries in every bite: Tossing them with flour helps prevent sinking, so they stay nicely distributed.
- No fussy decorating: A simple sugar sprinkle creates a subtle crackly top—pretty and effortless.
- Great for sharing: Ideal for brunch tables, bake sales, new-neighbor drop-offs, or a cozy breakfast-for-dinner moment.
“I made this for a weekend brunch and it disappeared before I could even set out the coffee. The lemon and blueberry combo tastes bakery-level, but it was honestly so easy.”
How this recipe comes together
Here’s the flow before you start measuring everything out:
- Cream butter, lemon zest, and sugar until fluffy—this builds the cake’s light texture.
- Add egg and vanilla to enrich and round out the flavor.
- Prep blueberries by tossing with a bit of flour (helps with even distribution).
- Mix dry ingredients separately so baking powder and salt are evenly dispersed.
- Alternate flour and buttermilk into the batter gently to avoid overmixing.
- Fold in blueberries, spread into a pan, sprinkle sugar, and bake until a toothpick comes out clean.
What you’ll need (Ingredients)
- ½ cup (8 tablespoons | 4 oz | 113 g) unsalted butter, room temperature
- Zest from 1 large lemon
- 1 cup (214 g) sugar (set aside 1 tablespoon for sprinkling)
- 1 egg, room temperature
- 1 tsp vanilla
- 2 cups (256 g) all-purpose flour (set aside 1/4 cup to toss with blueberries)
- 2 tsp baking powder
- 1 tsp kosher salt (I like 1.25 tsp)
- 2 cups fresh blueberries, picked over
- ½ cup buttermilk (see FAQs for substitutes)
Quick notes:
- Frozen blueberries can work, but they tend to bleed—there are tips in the Variations/FAQs.
- No lemon? You’ll lose some brightness, but it will still be a good blueberry cake.
Step-by-step instructions (Directions)
- Preheat the oven to 350ºF (175ºC).
- In a stand mixer (or with a hand mixer), cream the butter, lemon zest, and sugar (use 1 cup minus 1 tablespoon) until light and fluffy. This usually takes 2–4 minutes.
- Add the egg and vanilla. Beat just until combined. Scrape the bowl once so everything mixes evenly.
- In a small bowl, toss the blueberries with ¼ cup of the flour. Set aside.
- In another bowl, whisk together the remaining flour, baking powder, and salt.
- Add half of the flour mixture to the batter. Stir gently with a spatula until mostly incorporated.
- Pour in all of the buttermilk. Stir again—don’t worry if it looks a little uneven at first.
- Add the remaining flour mixture and stir just until you don’t see dry flour. Don’t overmix (that’s how cakes get tough).
- Fold in the blueberries, leaving any excess flour behind in the blueberry bowl.
- Grease an 8- or 9-inch square baking pan with butter or nonstick spray. For easiest removal, add parchment on top of the greased pan.
- Spread the batter evenly into the pan. Sprinkle the top with the reserved 1 tablespoon sugar.
- Bake 35–45 minutes:
- 9-inch pan: usually closer to 35 minutes
- 8-inch pan: often 40–45 minutes
Check with a toothpick in the center. If needed, bake a few minutes more. (It can take up to 50 minutes in some ovens/pans—be patient.)
- Cool at least 15 minutes before slicing so it sets and cuts cleanly.
Best ways to enjoy it (Serving suggestions)
- Serve warm with a pat of butter or a spoonful of Greek yogurt.
- Add a quick brunch “upgrade” with lemon curd or a light dusting of powdered sugar.
- Pair with scrambled eggs or an herby omelet to balance the sweetness.
- Drinks that fit: coffee, black tea, or iced latte. For brunch, it’s great with sparkling water + lemon or a mimosa.
How to store & freeze
- Room temperature: Store tightly covered for up to 2 days.
- Refrigerator: For longer storage, refrigerate in an airtight container for up to 5 days (the fridge can dry it slightly; warm slices briefly before serving).
- Freezing: Wrap individual slices in plastic wrap, then place in a freezer bag. Freeze for up to 2–3 months for best quality.
- Reheating: Warm slices in the microwave for 10–20 seconds or in a 300ºF oven until just heated through.
Food safety note: If the cake has been left out in a very warm environment for extended periods, use standard perishability judgment; when in doubt, refrigerate promptly and don’t leave it out all day.
Helpful cooking tips (Tricks for success)
- Room-temp butter and egg matter: They emulsify better, giving you a smoother batter and finer crumb.
- Don’t skip creaming: Beating butter + sugar properly adds air and helps the cake rise evenly.
- Fold, don’t stir aggressively: Once flour is in, gentle mixing keeps the cake tender.
- Check doneness correctly: Aim for a toothpick that comes out clean or with a few moist crumbs, not wet batter.
- Use parchment if you can: It makes lifting and slicing cleaner—especially if serving to guests.
Recipe variations (Creative twists)
- Lemon-almond version: Add ¼ tsp almond extract and sprinkle sliced almonds on top.
- Cinnamon crumb topping: Mix 2 tbsp butter + 2 tbsp brown sugar + ¼ tsp cinnamon + 3 tbsp flour; crumble over before baking.
- Mixed berry cake: Swap 1 cup blueberries for raspberries or blackberries (be gentle folding them in).
- Orange instead of lemon: Use orange zest for a softer citrus note.
- Dairy-free option (texture will vary): Use plant-based butter and “buttermilk” made with unsweetened almond/soy milk + acid (see FAQ).
FAQ (Your questions answered)
1) I don’t have buttermilk—what can I use?
You can make a quick substitute: add 1½ tsp lemon juice or white vinegar to ½ cup milk, stir, and let sit 5–10 minutes. It won’t be identical to real buttermilk, but it works well in this cake.
2) Can I use frozen blueberries?
Yes. For best results, use them straight from the freezer (don’t thaw) and toss with flour as directed. Expect a bit more purple streaking in the batter, and you may need a few extra minutes of bake time.
3) Why do you toss the blueberries with flour?
It helps blueberries stay suspended in the batter instead of sinking to the bottom. It also reduces wet pockets around the berries so the crumb bakes more evenly.
4) How do I know when it’s done without drying it out?
Start checking at the low end of the bake window. Look for:
- a golden top,
- edges pulling slightly from the pan, and
- a toothpick in the center coming out clean or with moist crumbs (not wet batter).
5) Can I bake this in a different pan?
Yes, but timing changes. A 9-inch square bakes faster than an 8-inch because the batter is thinner. If using a round pan or a loaf pan, keep the same oven temp and watch closely, checking for doneness with a toothpick.
Print
Buttermilk Blueberry Breakfast Cake
- Total Time: 50 minutes
- Yield: 8 servings
- Diet: Vegetarian
Description
A tender, buttery blueberry cake with bright lemon flavor, perfect for brunch or any day.
Ingredients
- ½ cup (8 tablespoons | 4 oz | 113 g) unsalted butter, room temperature
- Zest from 1 large lemon
- 1 cup (214 g) sugar (set aside 1 tablespoon for sprinkling)
- 1 egg, room temperature
- 1 tsp vanilla
- 2 cups (256 g) all-purpose flour (set aside ¼ cup to toss with blueberries)
- 2 tsp baking powder
- 1 tsp kosher salt (can use 1.25 tsp)
- 2 cups fresh blueberries, picked over
- ½ cup buttermilk
Instructions
- Preheat the oven to 350ºF (175ºC).
- Cream the butter, lemon zest, and sugar until light and fluffy (about 2–4 minutes).
- Add the egg and vanilla, beat until combined, and scrape the bowl.
- In a small bowl, toss the blueberries with ¼ cup of flour. Set aside.
- Whisk the remaining flour, baking powder, and salt in another bowl.
- Add half of the flour mixture to the batter; stir gently.
- Pour in all of the buttermilk; stir until mostly combined.
- Add the remaining flour mixture and mix just until there are no dry spots.
- Fold in the blueberries gently.
- Grease an 8- or 9-inch square baking pan and add parchment for easy removal.
- Spread the batter evenly in the pan and sprinkle with the reserved sugar.
- Bake for 35–45 minutes or until a toothpick comes out clean.
- Cool for at least 15 minutes before slicing.
Notes
Best enjoyed warm with butter or yogurt. Can be stored at room temperature for up to 2 days.
- Prep Time: 15 minutes
- Cook Time: 35 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American