Lemon Blueberry Sheet Cake – Bright, Fresh & Easy

This Lemon Blueberry Sheet Cake is my go-to when I want bright citrus flavor and juicy summer berries without fuss. It’s a tender, buttery sheet cake scented with fresh lemon zest, studded with blueberries, and finished with a simple lemon glaze — perfect for potlucks, brunches, or an easy dessert for a crowd. If you love citrus desserts, this pan cake delivers the same sunny flavor as a bright and beautiful layered dessert but in a weeknight-friendly format.

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Why you’ll love this Lemon Blueberry Sheet Cake recipe

This cake balances bright lemon and sweet blueberries in a fast, large-format bake. It’s designed to be:

• Quick to mix (one bowl for dry, one for wet, then combine).
• Crowd-friendly — a 9×13 feed a crowd with minimal effort.
• Flexible — works with fresh or frozen berries (see tips).

“A light, zesty cake with just enough glaze to keep it pretty and never cloying—my new party favorite.”

It’s perfect for weekend brunches, school events, or when you want a dessert that sings of fresh fruit without complicated layering. If you prefer a richer, layered take, you can compare this to a luscious lemon blueberry cheesecake cake for inspiration.

How this recipe comes together

A quick overview so you know what to expect:

1. Whisk dry ingredients together (flour, baking powder, baking soda, salt).
2. Cream butter and sugar until airy.
3. Add eggs, vanilla, and buttermilk to create a soft batter.
4. Fold in lemon juice, zest, and flour-coated blueberries to prevent sinking.
5. Bake in a greased, parchment-lined 9×13 pan for 40–45 minutes.
6. Cool completely, then pour on a powdered-sugar lemon glaze and let it set.

What you’ll need

• 3 cups all-purpose flour
• 2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1 1/4 teaspoon salt
• 1 cup (2 sticks) unsalted 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 (or make your own: 1 cup milk + 1 tbsp lemon juice, let sit 5 mins)
• 2 teaspoons vanilla extract
• 1 1/2 cups fresh blueberries, tossed with 1 tablespoon flour
• 2 1/2 cups powdered sugar (for glaze)
• 1/3 cup lemon juice (for glaze)

Notes/substitutions:

• Swap Greek yogurt (3/4 cup) for half the butter for a slightly lighter crumb.
• Frozen blueberries work fine—do not thaw; toss them frozen with the flour so they don’t bleed into the batter.

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Step-by-step instructions

1. Preheat oven to 350°F. Grease a 9×13-inch baking dish and line it with parchment, leaving an overhang on the long sides for easy removal.
2. In a medium bowl, whisk together 3 cups flour, 2 tsp baking powder, 1/2 tsp baking soda, and 1 1/4 tsp salt. Set aside.
3. In a stand mixer fitted with the paddle (or with a hand mixer), beat 1 cup softened butter and 1 1/2 cups granulated sugar until light and fluffy, about 3–4 minutes.
4. Add 4 eggs one at a time, mixing briefly after each. Stir in 2 tsp vanilla.
5. Mix in the 1 cup buttermilk on low speed until combined.
6. Add the dry ingredients and mix on low until no streaks of flour remain.
7. Stir in juice and zest of 2 lemons (about 1/4 cup juice and the zest).
8. Gently fold in the blueberries that have been tossed with 1 tbsp flour. This keeps them from sinking.
9. Pour batter into prepared pan and smooth the top. Bake 40–45 minutes, or until a toothpick inserted in the center comes out with moist crumbs.
10. Cool completely in the pan. You can lift the cake out using the parchment overhang or leave it in the dish to serve.
11. For the glaze: whisk 2 1/2 cups powdered sugar with 1/3 cup lemon juice until smooth. Drizzle over the cooled cake and let the glaze set. Garnish with extra blueberries or lemon slices if desired.
    

Best ways to enjoy it

• Serve slightly chilled or at room temperature with a dollop of whipped cream or vanilla ice cream.
• For brunch, pair with coffee, earl grey tea, or a sparkling Prosecco for a celebratory touch.
• Turn slices into dessert parfaits: layer cake crumbs with lemon curd and whipped cream for a composed treat.
• For a picnic, leave the cake in the pan, cover loosely with foil, and serve on a portable cutting board.

Include a chilled twist by exploring a chilled dessert like a lemon blueberry icebox cake for warm-weather entertaining.

Storage and reheating tips

• Room temp: Keep cake in an airtight container or loosely covered with foil for up to 2 days. The glaze may soften slightly.
• Refrigerator: Store covered for up to 5 days. Bring slices to room temp before serving for best texture.
• Freezing: Freeze unglazed cake (tightly wrapped) for up to 3 months. Thaw in the fridge overnight, then add fresh glaze before serving. If the cake is glazed, freeze individual slices between layers of parchment to avoid sticking.
• Food safety: If left at room temperature, don’t keep for more than 2 hours when temperatures are above 90°F.

Helpful cooking tips

• Measure flour correctly: spoon into the cup and level off to avoid a dense cake.
• Room-temperature eggs and butter emulsify better and produce a lighter crumb.
• Don’t overmix after adding flour — stir until just combined to keep the cake tender.
• Zest lemons before juicing so you don’t lose the oils.
• If using frozen blueberries, add a minute or two to the bake time; check for moist crumbs.
• Want extra lemon punch? Add 1/2 tsp lemon extract to the glaze.

Creative twists

• Blueberry streusel: sprinkle a simple oat streusel on the batter before baking for crunch.
• Almond swap: replace 1/2 cup flour with almond flour and add 1/2 tsp almond extract for a nutty note.
• Dairy-free: use dairy-free butter and a plant-based buttermilk (almond milk + vinegar).
• Boozy glaze: whisk in 1–2 tbsp limoncello or vodka to the glaze for adult-only gatherings.
  

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FAQ

Q: Can I make this cake ahead?
A: Yes — bake the cake, wrap well, and refrigerate up to 2 days without the glaze. Add the glaze just before serving for the freshest look.

Q: Why toss blueberries in flour?
A: Tossing berries in a little flour coats them and prevents them from sinking to the bottom during baking. It also reduces bleeding into the batter.

Q: Can I use frozen blueberries?
A: Absolutely. Keep them frozen and toss with flour; they hold up well and are a convenient year-round option. Add 1–2 extra minutes to bake time and check for moist crumbs.

Q: How do I fix a gluey or dense cake?
A: Overmeasuring flour or overmixing are common causes. Make sure to spoon and level flour, and mix dry ingredients into wet just until combined.

Q: Is buttermilk necessary?
A: Buttermilk adds tang and helps tenderize the crumb. You can substitute a milk + 1 tbsp vinegar/lemon juice mixture per cup if needed.

Conclusion

This Lemon Blueberry Sheet Cake is an easy, crowd-pleasing dessert that pairs bright citrus with juicy berries and a simple glaze. It’s forgiving, adaptable, and keeps well — give it a try at your next gathering and enjoy the compliments. Visit the blog for more recipes and variations.

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