lemon blueberry sheet cake is the recipe you reach for when you need something impressive without the fuss of stacking layers or complicated frosting. This 9×13 pan cake is moist, buttery, and bursting with juicy blueberries, then finished with a bright lemon glaze that hardens into a crackly, sweet topping. It’s the kind of cake that disappears at a cookout before you can even grab a second piece.
Love More Recipes? Try My Blueberry Lemon Cheesecake Bars or this Lemon Blueberry Bread next.
Why You’ll Love This
- No layers, no frosting skills needed — just mix, bake, and glaze.
- That lemon glaze is simpler than any frosting and tastes absolutely incredible.
- Dense, moist crumb that honestly feels more like a coffee cake — in the very best way.
- Makes 16 generous servings — it was built for sharing.
- Only about 20 minutes of hands-on time before the oven does the rest.
Lemon Blueberry Sheet Cake with Lemon Glaze
- Total Time: 1 hour 20 minutes
- Yield: 20 slices
Description
A one-bowl lemon blueberry sheet cake that stays moist for days thanks to sour cream and fresh lemon juice. Topped with a 3-ingredient lemon glaze that sets in 15 minutes. Bakes in a single 9×13 pan and feeds 20 — no stacking, no frosting skills needed.
Ingredients
LEMON BLUEBERRY SHEET CAKE
3 cups (360g) all-purpose flour
2 1/2 teaspoons baking powder
1/2 teaspoon salt
1 cup (230g) unsalted butter, softened to room temperature
2 cups (400g) granulated sugar
4 large eggs, room temperature
1 cup (240g) full-fat sour cream
1/2 cup (120ml) fresh lemon juice (about 3 lemons)
2 tablespoons lemon zest
1 teaspoon pure vanilla extract
2 cups (290g) fresh blueberries
2 tablespoons all-purpose flour (for coating blueberries)
LEMON GLAZE
2 cups (240g) powdered sugar
3–4 tablespoons fresh lemon juice
1 teaspoon lemon zest
Instructions
1. Preheat oven to 350°F. Grease a 9×13 pan with butter or baking spray and line the bottom with parchment paper. Set aside.
2. In a medium bowl, whisk the flour, baking powder, and salt together. Set aside.
3. Beat the softened butter and sugar together on medium-high speed for 3–4 minutes until the mixture turns very light in color and looks fluffy.
4. Add the eggs one at a time, mixing well after each one. Add the sour cream, lemon juice, lemon zest, and vanilla extract; mix until the batter looks smooth and uniform.
5. Add the flour mixture to the wet ingredients and fold with a rubber spatula until just combined — stop as soon as no dry streaks remain. Do not beat.
6. Toss the blueberries with the 2 tablespoons of flour in a small bowl until coated. Fold gently into the batter. Spread into the prepared pan and smooth the top with a spatula.
7. Bake for 35–40 minutes until a toothpick inserted in the center comes out clean or with a few moist crumbs. Cool in the pan on a wire rack for at least 20 minutes before glazing.
8. Whisk powdered sugar, lemon juice, and lemon zest together until smooth. Start with 3 tablespoons of lemon juice; add more a teaspoon at a time until the glaze drips slowly from a spoon — it should flow, not pour. Drizzle over the fully cooled cake and let it set for 15 minutes before slicing.
Notes
Coat the blueberries in flour right before adding them — this step reduces sinking and is not optional.
Fold the flour in gently with a spatula and stop the moment no dry streaks remain. Overmixing activates too much gluten and makes the cake dense instead of tender.
Glaze only a fully cooled cake — glaze on a warm cake soaks straight in and disappears from the surface. Wait a full 30 minutes after the cake comes out of the oven.
For best results, measure flour by spooning into the measuring cup and leveling off — do not scoop directly from the bag. Or use a kitchen scale.
Store covered at room temperature up to 2 days or refrigerated up to 5 days. Pull refrigerated cake out 30 minutes before serving.
Freeze unglazed cake (wrapped tightly in plastic wrap + foil) up to 2 months. Thaw at room temperature; glaze after thawing.
- Prep Time: 20 minutes
- Cook Time: 40 minutes
- Category: Dessert
- Method: Bake
- Cuisine: American
Ingredients
Sheet Cake
- 3 cups all-purpose flour (plain flour)
- 2 teaspoons baking powder
- 1/2 teaspoon baking soda
- 1 1/4 teaspoons salt
- 1 cup (2 sticks) butter, softened
- 1 1/2 cups granulated sugar
- Juice and zest of 2 lemons (about 1/4 cup lemon juice)
- 4 large eggs
- 1 cup buttermilk
- 2 teaspoons vanilla extract
- 1 1/2 cups fresh blueberries, tossed with 1 tablespoon flour
Lemon Glaze
- 2 1/2 cups powdered sugar
- 1/3 cup fresh lemon juice
No buttermilk in the fridge? Make your own! Add 1 tablespoon of white vinegar or lemon juice to a measuring cup, then fill to 1 cup with regular milk. Stir and let it sit for 5 minutes before using. For the blueberries, fresh is best — but frozen blueberries (thawed and patted dry) have worked well for many home bakers too.
Why These Ingredients Work
Buttermilk is what makes this cake so tender and moist. The acidity in buttermilk reacts with the leaveners to help the cake rise, while the fat content keeps every bite soft and rich. It also adds a subtle tanginess that plays beautifully with the lemon.
A full cup of butter (2 sticks) gives this cake its wonderfully dense, rich texture — different from a light and airy birthday cake, and that’s exactly the point. Think buttery coffee cake, and you’re in the right mindset.
Tossing the blueberries in flour before adding them to the batter is the best trick for preventing them from sinking to the bottom. The flour coating gives the blueberries a little grip in the batter.
The simple lemon glaze — just powdered sugar and lemon juice — sets up into a beautiful crackly topping that makes every single slice look like it came from a bakery. No buttercream stress required.
Tools Needed
- 9×13 baking dish (glass works great)
- Parchment paper (cut with overhang on the long sides)
- Stand mixer or hand mixer
- Two mixing bowls
- Spatula
- Toothpick for testing doneness
How To Make Easy Lemon Blueberry Sheet Cake
Step 1: Prep the Pan and Preheat
Preheat your oven to 350°F. Grease your 9×13 baking dish, then line it with parchment paper — leave an overhang on the two long sides so you can easily lift the cake out later. This small step makes cutting and serving so much easier!
Step 2: Mix the Dry Ingredients
In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set this aside while you work on the wet ingredients.
Step 3: Cream Butter, Sugar, and Wet Ingredients
In your stand mixer or with a hand mixer, cream the butter and sugar together until light and fluffy — about 3 minutes. Add the eggs, vanilla, and buttermilk and mix on low until incorporated. Don’t worry if it looks a little curdled at this stage; it will come together once the flour goes in.
Step 4: Combine and Add the Lemon
Add the dry ingredients to the wet mixture and mix until no streaks of flour remain. Pour in the lemon juice and stir in the zest. The batter will be thick — that’s perfect.
Step 5: Fold in the Blueberries and Bake
Toss your blueberries with the tablespoon of flour, then gently fold them into the batter with a spatula. Pour into your prepared pan and spread evenly. Bake for 40–45 minutes, or until a toothpick inserted in the center comes out with moist crumbs (not wet batter). Let cool completely in the pan before glazing.
Step 6: Make the Lemon Glaze
Whisk the powdered sugar and lemon juice together until smooth and pourable. Pour over the completely cooled cake and let it spread naturally. Allow the glaze to set and harden before slicing — about 15–20 minutes. Garnish with a few fresh blueberries on top if you’re serving to guests.
You Must Know
Cool the cake completely before glazing. A warm cake will cause the glaze to melt and run right off, giving you a sticky pool rather than that gorgeous crackly topping. Patience here is absolutely worth it — let it cool fully, even if it takes 2 hours.
All ingredients should be at room temperature — especially the eggs and butter. Cold eggs added to creamed butter will make the mixture seize up and look curdled, leading to a denser texture. Set everything out an hour ahead.
Check your baking powder and soda. These are the main lift agents in this cake. If they’re old (over 6 months), your cake won’t rise properly and will be dense and flat. Fresh leaveners make a huge difference.
Amelia’s Secret: Instead of adding all the blueberries to the batter, I press about half of them gently onto the top of the batter after spreading it in the pan. This gives you blueberries on the surface that are beautifully visible in every slice and stay closer to the top throughout baking.
Pro Tips & Mistakes to Avoid
Don’t overbake. This is a dense, buttery cake that continues to firm up as it cools. Pull it out when the toothpick shows moist crumbs — not wet, but not bone dry either. Overbaking makes it tough.
Line the pan with parchment. It makes the whole experience so much easier. You can lift the entire cake out, set it on a cutting board, and slice it cleanly without fighting with the pan.
Fresh lemon juice in the glaze makes a real difference. The bottled stuff tastes flat and can make the glaze taste almost artificial. With just two lemons, you’ll have more than enough for both the cake and the glaze.
Flavor Variations
Lemon Poppy Seed: Add 2 tablespoons of poppy seeds to the batter along with the dry ingredients for a classic bakery flavor that pairs perfectly with the lemon glaze.
Orange Blueberry: Substitute the lemon juice and zest for orange — in both the cake and the glaze. The result is a sweeter, slightly more mellow citrus cake that’s perfect for fall.
Cream Cheese Frosting Swap: Skip the glaze and top the cooled cake with lemon cream cheese frosting instead for a richer, more decadent finish.
Gluten-Free: Several readers have had success using a 1:1 gluten-free flour blend — you may need a few extra minutes of bake time. Check for doneness with a toothpick.
Make-Ahead
This cake is a wonderful make-ahead option — it actually gets even more moist overnight as the flavors settle! Bake the cake and let it cool completely, then cover tightly with plastic wrap (without glazing) and refrigerate for up to 2 days, or store at room temperature for 1 day. Add the lemon glaze on the day you’re serving it for the freshest look and best crackly texture.
Serving Suggestions
Slice directly from the pan or lift out onto a cutting board for a cleaner presentation. This cake is equally at home at a summer BBQ, a baby shower brunch, or alongside an afternoon cup of tea.
Serve with a scoop of vanilla ice cream for a simple but impressive dessert, or alongside fresh berries for a bright, summery plate.
How to Store
Cover the cake tightly with plastic wrap or store in an airtight container. At room temperature, it keeps well for up to 2 days. In the refrigerator, it stays fresh for up to 5 days. The refrigerator actually helps preserve the moisture — just bring slices back to room temp before eating for best flavor. This cake also freezes before glazing — wrap tightly and freeze for up to 2 months. Thaw, then glaze before serving.
Allergy Info
Contains dairy (butter, buttermilk), eggs, and gluten (all-purpose flour). For gluten-free, use a certified 1:1 gluten-free flour blend. For dairy-free, use plant-based butter and make a dairy-free buttermilk by combining non-dairy milk with lemon juice or vinegar.
Frequently Asked Questions
Can I use frozen blueberries?
Yes! Several readers have had great results with frozen blueberries. If you use frozen, thaw them first and pat them dry with paper towels to remove extra moisture. Still toss them in flour before adding to the batter. The batter may turn slightly purple from the berry juice — that’s totally normal and doesn’t affect the flavor at all.
Can I make this a day ahead?
Absolutely — and it’s actually great for it! Bake and cool the cake, then cover tightly and store at room temperature or in the refrigerator. Hold off on adding the glaze until the day you’re serving. This keeps the glaze looking fresh and crackly rather than soaking into the cake.
My cake came out dense — what went wrong?
This is actually a naturally dense, buttery cake (similar to a coffee cake), so some density is expected and delicious. If it’s too dense, it could be that your baking powder or baking soda were old, your eggs were cold, or the batter was overmixed. Make sure your leaveners are fresh and your eggs are at room temperature before starting.
How much lemon juice do I need for the cake vs the glaze?
The cake uses about 1/4 cup of lemon juice (roughly 2 lemons), while the glaze needs about 1/3 cup (roughly 1.5 additional lemons). In total, plan for 3–4 medium lemons for both the cake and the glaze to be safe. Fresh juice is always the best choice over bottled.
Can I use this recipe in round cake pans?
Yes! Several readers have baked this in two round 8-inch or 9-inch pans and even used it as a two-layer birthday cake with cream cheese frosting. Bake at 350°F and start checking for doneness around 30–35 minutes.
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