Blueberry Sheet Cake with Vanilla Glaze

This blueberry sheet cake combines a buttery, tender crumb with pockets of juicy fruit. A simple 9-by-13-inch pan makes it easy to slice and share.

You do not need to stack layers or use unusual equipment. Mix the batter, fold in the berries, and bake; add the vanilla glaze only if you want a sweeter finish.

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Blueberry Sheet Cake with Optional Vanilla Glaze

A soft 9-by-13-inch butter cake filled with blueberries and finished with an optional vanilla glaze.

Prep Time 20 minutes

Cook Time 40 minutes

Total Time 1 hour 45 minutes

Difficulty Easy

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Ingredients

• 2 cups (240g) all-purpose flour
• 2 tsp baking powder
• ½ tsp salt
• 1 cup (2 sticks) unsalted butter, softened
• 1½ cups (300g) granulated sugar
• 3 large eggs
• 1 tbsp vanilla extract
• 1 cup (240ml) whole milk
• 2 cups (300g) fresh blueberries
• 1 tbsp all-purpose flour, for coating berries
• Optional glaze: 1 cup (120g) powdered sugar
• Optional glaze: 2 tbsp milk
• Optional glaze: ½ tsp vanilla extract

Instructions

1. Preheat the oven to 350°F (175°C) and grease a 9-by-13-inch baking pan.
2. Beat softened butter and sugar for 2–3 minutes until pale and fluffy. Beat in the eggs one at a time, then add vanilla.
3. Whisk flour, baking powder, and salt in a separate bowl. Add the dry mixture in three portions, alternating with milk in two portions, beginning and ending with dry ingredients. Mix just until combined.
4. Toss the blueberries with 1 tablespoon flour, then fold gently into the batter. Spread in the prepared pan.
5. Bake about 35–40 minutes. Start checking near 30 minutes; a tester inserted into the center should show no wet batter.
6. Rest in the pan for 10–15 minutes, then cool completely on a rack. For optional glaze, whisk powdered sugar, milk, and vanilla and drizzle over the cooled cake.

Notes

• The original headline promised 35 minutes, but its method bakes for 35–40 minutes and requires cooling. The total time here includes approximately 45 minutes of cooling; actual time varies. Glaze is optional.

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🫐 Why You’ll Love This Blueberry Sheet Cake

This cake is a practical dessert for a group, and the fresh blueberries give it more than one flavor and texture.

1. Straightforward method

The batter follows familiar creaming and mixing steps and bakes in one pan, so a beginner can follow it without assembling layers.

Kitchen note: This is a one-pan cake, but give it enough time to bake and cool before slicing.

2. Plenty of blueberries

Two cups of berries give the slices juicy, slightly tart pockets against the sweet crumb.

3. One pan to share

A 9-by-13-inch pan yields squares that are easy to take to a picnic or serve at a gathering.

4. Tender texture

Butter, milk, and eggs help create a soft cake, while gentle mixing prevents the crumb from becoming heavy.

5. Flexible serving

Serve an unglazed square with coffee or drizzle the cooled cake for dessert. Vanilla ice cream is another optional topping.

6. Easy to portion

Cut it into larger dessert pieces or smaller squares for a party; use an additional pan if making a larger batch.

📝 Ingredients You’ll Need

The ingredient table keeps the original quantities and explains how each component affects the batter.

Optional vanilla glaze ingredients:

Optional finish: Skip the glaze for a less sweet cake or dust the cooled top lightly with powdered sugar.

🧁 How to Make Blueberry Sheet Cake: Step-by-Step

🥄 Step 1: Preheat and Prep

Heat the oven and prepare the baking pan before mixing the batter.

• Preheat the oven to 350°F (175°C).
• Grease a 9-by-13-inch baking pan.
• Line it with parchment if you want to lift the cooled cake out more easily.

A fully preheated oven helps the cake rise and bake evenly.

🧈 Step 2: Cream the Butter and Sugar

Creaming softened butter with sugar incorporates air and sets up a lighter cake.

• Put 1 cup softened unsalted butter and 1½ cups sugar in a large bowl.
• Beat with a mixer for about 2–3 minutes until pale and fluffy.

Beat until the mixture becomes paler and fluffy, then move to the eggs.

🥚 Step 3: Add Eggs and Vanilla

Add the eggs one at a time, followed by vanilla.

• Beat in all three eggs, one at a time.
• Mix in 1 tablespoon vanilla extract once the eggs are combined.

Let each egg blend into the butter mixture before adding the next; this helps the batter stay smooth.

🥣 Step 4: Mix the Dry Ingredients

Whisk the flour, baking powder, and salt together in a separate bowl.

• 2 cups all-purpose flour
• 2 tsp baking powder
• ½ tsp salt

Distributing the leavening now helps the cake rise evenly.

🥛 Step 5: Combine Wet and Dry (With Milk)

Alternate the dry mixture with milk as you finish the batter.

• Add dry ingredients in three portions, alternating with 1 cup milk in two portions.
• Begin and end with flour; mix gently at low speed.

Use this order:

1. Fold in one-third of the dry mixture.
2. Add half the milk.
3. Fold in another third of the dry mixture.
4. Add the remaining milk.
5. Mix in the final dry portion just until incorporated.

Mix only until the last streaks of flour disappear. Extra beating after flour is added can make the cake tougher.

🫐 Step 6: Prepare the Blueberries

A light coating of flour helps the blueberries stay more evenly distributed in the batter.

• Toss 2 cups fresh blueberries with 1 tablespoon flour.
• Use a light coating rather than a heavy layer of flour.

If you want a more jammy note, gently crush a few berries before folding them in.

🍰 Step 7: Fold in the Blueberries

Fold the prepared blueberries into the batter with a spatula.

• Fold the coated berries through the batter with a spatula; stop once they are spread evenly.

Use a few gentle turns so the berries remain mostly whole and the batter does not turn completely purple.

🏃‍♀️ Step 8: Pour and Spread

Transfer the batter to the prepared pan and smooth it into the corners.

• Pour the batter into the prepared 9-by-13-inch pan.
• Smooth the surface and push batter into each corner.

A few additional berries on top are optional for appearance.

🔥 Step 9: Bake to Golden Perfection

• Place the pan in the fully heated oven.
• Bake for about 35–40 minutes, depending on the oven.
• Begin checking near 30 minutes; a tester should show no wet batter.

If the top browns before the center is baked, tent it loosely with foil near the end of baking.

❄️ Step 10: Cool Down

Once the cake has baked, give it a short rest in the pan.

• Rest the cake in the pan for 10–15 minutes.
• Move it to a rack and cool completely before decorating or slicing.

Wait until it is fully cool before slicing or glazing, or the cake may crumble and the glaze may melt.

🍥 Step 11: (Optional) Add the Glaze

For a sweeter finish, drizzle the cooled sheet cake with the simple vanilla glaze.

How to Make It:

• Measure 1 cup powdered sugar.
• Add 2 tablespoons milk.
• Stir in ½ teaspoon vanilla, whisk smooth, and drizzle over the cooled cake.

🍥 Make the Vanilla Glaze (Optional but Yummy)

The optional glaze adds a thin, sweet layer that highlights the blueberry flavor and gives the top a finished look.

✨ Why Add Glaze?

• A thin glaze adds shine to the top.
• Vanilla sweetness balances the berries’ tang.
• Lemon, almond, or maple can replace vanilla for a variation.

🧪 Simple 3-Ingredient Vanilla Glaze Recipe

👩‍🍳 How to Make It (Step-by-Step)

1. Sift powdered sugar into a bowl.
2. Add milk gradually while stirring.
3. Mix in vanilla extract.
4. Stop when the glaze flows slowly from a spoon.

Glaze check: Add powdered sugar if too thin, or milk a few drops at a time if too thick.

🧁 How to Glaze the Cake Perfectly

• Glaze only after the cake is fully cool.
• Drizzle with a spoon or piping bag.
• Use an offset spatula for a thin, even layer if preferred.
• Let the glaze set for about 10–15 minutes before cutting.

Lemon zest can bring a citrus note to the vanilla glaze; a small pinch of cinnamon gives it a warmer flavor.

🔥 Pro Tips for the Best Sheet Cake Every Time

A few details in mixing, baking, and cooling make this sheet cake more reliable.

1. Use room-temperature ingredients

Softened butter and eggs blend into a smoother batter. Let them warm briefly before mixing, without leaving perishables out longer than necessary.

If the butter is still firm, soften it carefully in very short microwave intervals rather than melting it.

2. Stop mixing once combined

Too much mixing after flour is added can develop gluten and make the cake dense.

• Once flour is added, stop mixing as soon as it disappears.
• A few small lumps are preferable to an overworked batter.

3. Coat the berries lightly

The tablespoon of flour helps distribute the blueberries and reduces color streaking.

• One tablespoon of flour provides a light coating for the berries.
• Gentle folding helps limit blueberry streaks.

4. Choose the right pan

• A metal 9-by-13-inch pan gives predictable browning.
• Glass or ceramic can bake differently, so test the center rather than assuming the same time.

5. Test the center

Insert a toothpick or skewer into the center:

• A clean tester or a few moist crumbs indicate doneness.
• Wet batter on the tester means the cake needs more time.

Also look for these signs:

• The top should look lightly golden.
• The center should spring back when touched gently.

6. Cool before decorating

A warm cake can absorb or melt the glaze:

• Warm glaze can sink into the cake rather than set on top.
• Warm cake may tear when sliced.

Give the cake roughly 30–45 minutes to cool before glazing, depending on room and pan temperature.

7. Finish simply

• Press a few extra berries onto the batter before baking.
• Dust cooled, unglazed cake with powdered sugar.
• Try mint or thin lemon curls for a fresh garnish.

8. Make it ahead

You can bake the cake the previous day and decorate it when you plan to serve.

• Bake a day ahead if convenient.
• Keep the cooled cake covered and undecorated.
• Add glaze shortly before serving for a neat finish.

🧊 How to Store and Freeze Blueberry Sheet Cake

Cool the cake completely before covering it. The best storage method depends on how soon you will serve it and whether it has been glazed.

📦 How to Store at Room Temperature

Best for an unglazed cake you plan to eat within a couple of days.

• Cool the cake completely.
• Cover the pan tightly or transfer slices to a sealed container.
• Keep it away from heat and direct sunlight.

In a hot or humid kitchen, refrigerating the covered cake may preserve its quality better.

🧁 How to Store in the Refrigerator

Best when you need to keep the covered cake for several days.

• Wrap the pan or seal individual slices well.
• Let a chilled slice come closer to room temperature if you prefer a softer texture.
• Warm an individual slice briefly only if it has no glaze that may melt.

A chilled slice can be served cold or allowed to lose its refrigerator chill before eating.

❄️ How to Freeze for Later

Freezing works best for cake that has cooled and has not yet been glazed.

🧊 Whole cake

1. Cool the cake fully.
2. Wrap the whole unglazed cake closely.
3. Add a second protective layer or a freezer-safe bag.
4. Freeze for up to two months for best quality.

🧊 Individual squares

1. Cut the cake into squares.
2. Wrap each square and group them in a freezer bag.
3. Label the package with the date.

🔁 To thaw:

• Thaw wrapped cake in the refrigerator or at room temperature.
• Add glaze after thawing for the best finish.

Freezer tip: Freeze unglazed cake when possible; glaze may turn sticky after thawing.

🌟 Final Thoughts: Blueberry Sheet Cake Is Always a Good Idea

This blueberry sheet cake makes good use of fresh berries without requiring complicated decoration.

A bowl, mixer, and 9-by-13-inch pan handle most of the work.

It can be served plain at brunch or dressed up with a thin glaze for a celebration.

Follow the measured batter and check doneness rather than relying only on the clock.

🍓 More Easy Desserts You’ll Love

For more fruit-forward dessert ideas, these related posts are worth a look:

👉 Quick Summer Dessert Ideas
A collection of fruit-forward and chilled desserts for warm days.

👉 Banana Split Cake
A no-bake-style dessert with banana, chocolate, and whipped topping.

👉 Lemon Blueberry Cake
A citrus-and-berry cake for another take on blueberries.

dana

Dana Brooks is a home-cooking writer at Feastbears, where she shares easy family recipes, cozy dinners, quick desserts, and beginner-friendly kitchen tips. Her goal is to make everyday cooking feel simple, warm, and enjoyable for busy home cooks.