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Lemon Poppy Seed Cake is a bright, tender 9×13 sheet cake bursting with fresh lemon and crunchy poppy seeds, all under a tangy lemon buttercream. I bake this when the lemons are piled up and a spring afternoon calls for something sunny, and it never lasts long. If you love a citrus dessert, our lemon blueberry pound cake is another bright favorite.
Soft, buttery, and packed with zesty lemon flavor, this easy sheet cake is sunshine in every slice.
Lemon Poppy Seed Cake Quick Look
- 🕒 Prep Time: 15 minutes
- 🌡️ Cook Time: 42 minutes
- ⏳ Total Time: 57 minutes
- 🍽️ Serving: 15 servings
- ⚡ Calories: 385kcal
- 🌶️ Flavor Profile: Bright and lemony with crunchy poppy seeds and tangy buttercream
- ✋ Difficulty: Easy, a simple sheet cake like our marble cake
Quick Answer
Cream butter and sugar, beat in eggs, then alternate adding the dry ingredients with milk, fresh lemon juice, zest, and vanilla. Stir in poppy seeds, spread the batter into a 9×13 dish, and bake at 350 degrees for about 35 to 42 minutes until a toothpick comes out clean. Cool completely, then top with a tangy lemon buttercream, slice, and serve.
Jump to:
Why This Recipe Works
Click to see the technique science
- Fresh lemon juice and zest pack the flavor. Both the juice and the zest of fresh lemons go into the batter and the frosting for bright, natural citrus flavor in every bite.
- Poppy seeds add gentle crunch. A quarter cup of poppy seeds folds right in, giving the soft cake a subtle, nutty texture and that classic speckled look.
- Creaming the butter makes it tender. Beating the butter and sugar until light and fluffy traps air for a soft, even crumb.
- A 9×13 dish keeps it simple. Baking it as a single sheet cake skips the layering, so it is easy to make, frost, and serve to a crowd.
- Lemon buttercream doubles the citrus. A tangy lemon buttercream on top echoes the cake and balances the sweetness perfectly.
- It travels and keeps beautifully. Made right in the pan, this cake is easy to cover and carry, and it stays moist for days.
Why You’ll Love This Recipe
- It is an easy one-bowl-style sheet cake, no layers to stack or level.
- It is bright and refreshing, perfect for spring, Easter, and brunch next to our lemon blueberry coffee cake.
- It feeds a crowd and tastes even better the next day, making it a great make-ahead dessert.
Key Ingredients
Simple pantry staples and a few fresh lemons make this sunny cake. Here are the ones that matter most.
- Fresh lemons: You need both the juice and the zest, fresh lemons give the brightest flavor that bottled juice just cannot match.
- Poppy seeds: These add a gentle crunch and the signature speckled look, use fresh ones for the best texture.
- Butter: Softened butter creamed with sugar gives the cake its tender, buttery crumb, and more goes into the frosting.
- Whole milk: Milk keeps the batter moist and the crumb soft, bring it to room temperature so it blends smoothly.
- Powdered sugar: Confectioners sugar whips into the lemon buttercream for a smooth, sweet-tart topping.
See recipe card for exact quantities.
Variations and Substitutions
This cake is a great base to make your own. A few favorite twists:
- Add a lemon glaze: Skip the buttercream and brush on a simple lemon juice and powdered sugar glaze for a lighter finish, like a classic pound cake.
- Make it blueberry: Fold a cup of fresh blueberries into the batter for a lemon blueberry version.
- Bake it as a loaf: Divide the batter between two loaf pans for pretty lemon poppy seed loaves, adjusting the bake time.
- Add almond: Swap a teaspoon of the vanilla for almond extract for a subtle, bakery-style flavor.
How to Make Lemon Poppy Seed Cake
- Cream the butter and sugar until light and fluffy, then beat in the eggs one at a time.
- Stir in the flour mixture of flour, baking powder, and salt until just combined.
- Mix in the milk, fresh lemon juice, lemon zest, and vanilla until combined.
- Stir in the poppy seeds until evenly distributed, being careful not to overmix.
- Spread the batter into a greased 9×13 dish and bake at 350 degrees for 35 to 42 minutes, until a toothpick comes out clean. Cool completely.
- Whip the lemon buttercream, spread it over the cooled cake, then slice and serve.
Recipe Tips & Tricks
- Zest the lemons before juicing them, it is much easier to zest a whole lemon than a juiced one.
- Bring the butter, eggs, and milk to room temperature so the batter comes together smoothly and bakes evenly.
- Do not overmix once the flour goes in, stir just until combined for the most tender crumb.
- Cool the cake completely before frosting, or the lemon buttercream will melt and slide off.
- Use fresh poppy seeds, older seeds can taste bitter, so buy from a busy store for the best flavor.
- Store it covered at room temperature or in the fridge, and bring slices to room temperature before serving.
Serving Ideas and Suggestions
This Lemon Poppy Seed Cake is a slice of sunshine on any dessert table, with its tender lemon crumb and tangy buttercream. Garnish each piece with a thin lemon slice and a sprig of mint for a pretty, bakery-style finish.
It is perfect for spring celebrations, Easter brunch, baby showers, and Mother’s Day, right alongside our lemon blueberry trifle and lemon blueberry pound cake. A pot of tea or coffee makes it feel extra special.
It travels well in the pan, so it is an easy one to bring to a potluck or picnic. Serve it slightly chilled on a hot day, or at room temperature for the softest, most flavorful crumb.
Lemon Poppy Seed Cake FAQs
The combination of creamed butter, whole milk, and not overbaking keeps this cake wonderfully moist. Pulling it from the oven as soon as a toothpick comes out with just a few crumbs, rather than baking it dry, is the key to a tender crumb.
Yes, it is a great make-ahead dessert. Bake the cake up to two days ahead and store it covered, then frost the day you plan to serve. The flavor actually deepens and the crumb stays moist overnight.
Store the frosted cake covered at room temperature for up to two days, or in the refrigerator for up to five days. Let chilled slices sit out for about 15 minutes before serving for the softest texture.
Absolutely. Freeze the unfrosted cake tightly wrapped for up to three months, then thaw overnight and frost before serving. You can also freeze fully frosted slices on a tray, then wrap them individually.
No soaking is needed for this recipe. The poppy seeds are stirred straight into the batter, where they soften slightly as the cake bakes and add a pleasant, gentle crunch.
Yes. Divide the batter among lined muffin tins, filling each about two-thirds full, and bake at 350 degrees for about 18 to 22 minutes until a toothpick comes out clean. Cool completely before frosting with the lemon buttercream.
Craving more citrus desserts? Try our lemon blueberry pound cake or a layered lemon blueberry trifle next.
Love lemon desserts? Our moist Lemon Bread is an easy quick bread with a tangy lemon glaze.
Lemon Poppy Seed Cake
Ingredients
- 2 cups + 2 tablespoons all-purpose flour
- 1 tablespoon baking powder
- 1/2 teaspoon fine sea salt
- 3/4 cup unsalted butter softened
- 1 3/4 cup granulated sugar
- 3 large eggs
- 1 cup whole milk room temperature
- 1/4 cup lemon juice fresh squeezed
- zest of 2 lemons
- 1 tablespoon vanilla extract
- 1/4 cup poppy seeds
For the frosting:
- 1/2 cup unsalted butter softened
- 2 cups powdered sugar
- pinch of sea salt
- 1 tablespoon lemon juice fresh squeezed
- zest of 1 lemon
- 1 teaspoon vanilla extract
Instructions
- Preheat the oven to 350°F. Spray a 9×13 baking dish with baking spray, set aside.2 cups + 2 tablespoons all-purpose flour
- In a medium-sized bowl, mix together the flour, baking powder, and salt, set aside.2 cups + 2 tablespoons all-purpose flour
- In the body of a stand mixer with the paddle attachment, cream together the butter and the sugar and until light and fluffy, 2 minutes. Scrape down the sides.2 cups + 2 tablespoons all-purpose flour
- Add the eggs in one at a time, allowing them to fully combine into the mixture.2 cups + 2 tablespoons all-purpose flour
- Scrape down the sides and add the flour mixture. Gently stir it in until just combined.2 cups + 2 tablespoons all-purpose flour
- Add the milk, lemon juice, lemon zest, and vanilla, stir in until combined, scrape down the sides.2 cups + 2 tablespoons all-purpose flour
- Last, add the poppyseeds and stir them in until evenly distributed, do not over mix.2 cups + 2 tablespoons all-purpose flour
- Add the cake batter to the baking dish and bake for 35-42 minutes, until a toothpick inserted into the center comes out clean. A few crumbs left on the toothpick are okay, but any wet batter and it needs to bake longer.2 cups + 2 tablespoons all-purpose flour
- Place the dish on a wire rack to cool completely.2 cups + 2 tablespoons all-purpose flour
- While the cake cools, make the frosting by placing the butter into a large bowl with an electric hand mixer. Mix until smooth, 1 minute. Add the powdered sugar a little at a time until fully incorporated. Add the lemon juice, zest, and vanilla, mix until combined. Turn the mixer on medium and whip the frosting until light and fluffy, 3 minutes.2 cups + 2 tablespoons all-purpose flour
- Once the cake is cooled, frost with lemon buttercream. Slice and serve.2 cups + 2 tablespoons all-purpose flour
Notes
- We love fresh squeezed lemon juice for this recipe and highly suggest it, but in a pinch you can use bottled.
- If you don’t want to frost this cake you can also use a glaze or eat it as is.
- Use as much or as little lemon juice as you’d like for flavor.
- You can add more or less poppy seeds to your liking.
- This cake needs to cool completely before frosting.
Nutrition
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