If you’re craving a bright, zesty dessert that comes together with minimal fuss, a lemon sheet cake in a 9×13 pan is the answer. This classic cake is soft, moist, and bursting with fresh lemon flavor—perfect for potlucks, birthdays, or any occasion where you need a crowd-pleasing treat that’s easy to slice and serve.
Ingredients
- 2 1/2 cups (320g) all-purpose flour
- 2 teaspoons baking powder
- 1/2 teaspoon baking soda
- 1/2 teaspoon fine salt
- 1 cup (226g) unsalted butter, softened
- 2 cups (400g) granulated sugar
- 4 large eggs, room temperature
- 2 tablespoons finely grated lemon zest (from 2-3 lemons)
- 1/2 cup (120ml) freshly squeezed lemon juice (about 2-3 lemons)
- 1 cup (240ml) buttermilk, room temperature
- 1 teaspoon pure vanilla extract
- For the Lemon Icing:
- 2 cups (240g) powdered sugar, sifted
- 3-4 tablespoons freshly squeezed lemon juice
- 1 tablespoon unsalted butter, melted
- Pinch of salt
Instructions
- Preheat the oven to 350°F (175°C). Grease a 9×13-inch baking pan and line the bottom with parchment paper for easy removal.
- Mix the dry ingredients: In a medium bowl, whisk together the flour, baking powder, baking soda, and salt. Set aside.
- Cream the butter and sugar: In a large mixing bowl or stand mixer, beat the softened butter and granulated sugar together on medium-high speed until pale and fluffy, about 3-4 minutes. Scrape down the sides as needed.
- Add eggs and flavorings: Beat in the eggs one at a time, mixing well after each addition. Add lemon zest, lemon juice, and vanilla extract, and mix until combined (the mixture may look slightly curdled—this is normal).
- Combine wet and dry ingredients: With the mixer on low speed, add the flour mixture in three additions, alternating with the buttermilk. Begin and end with the flour. Mix just until combined; do not overmix.
- Bake: Pour the batter into the prepared pan and smooth the top with a spatula. Bake for 28-34 minutes, or until a toothpick inserted into the center comes out clean or with just a few moist crumbs.
- Cool: Place the pan on a wire rack and let the cake cool completely in the pan before icing.
- Make the icing: In a medium bowl, whisk together the powdered sugar, 3 tablespoons lemon juice, melted butter, and a pinch of salt until smooth. If needed, add more lemon juice a teaspoon at a time to reach a thick but pourable consistency.
- Ice the cake: Pour the icing over the cooled cake and spread evenly with an offset spatula. Allow the icing to set for at least 30 minutes before slicing.
- Serve: Cut into squares or rectangles and enjoy!
Tips
- Buttermilk Substitute: If you don’t have buttermilk, mix 1 cup whole milk with 1 tablespoon lemon juice or white vinegar. Let it sit for 5 minutes before using.
- Lemon Zest: Use a microplane or fine grater to zest only the yellow part of the lemon—avoid the bitter white pith underneath.
- Don’t Overmix: Overmixing the batter can make your cake tough. Mix just until the flour is incorporated.
- Testing for Doneness: Begin checking the cake at 28 minutes. Every oven varies, and overbaking will dry out the cake.
Serving Suggestions
- With Fresh Berries: Serve each slice with a handful of blueberries, raspberries, or sliced strawberries for a burst of color and flavor.
- Whipped Cream: A dollop of lightly sweetened whipped cream complements the tangy lemon perfectly.
- Tea or Coffee: This cake pairs beautifully with a hot cup of tea or coffee, making it ideal for an afternoon treat or brunch.
- Powdered Sugar Dusting: For extra flair, dust the top lightly with powdered sugar just before serving.
Variations
- Lemon Blueberry Sheet Cake: Fold 1 cup fresh or frozen (unthawed) blueberries into the batter just before baking. Toss them with a tablespoon of flour first to prevent sinking.
- Lemon Poppy Seed: Add 2 tablespoons poppy seeds to the dry ingredients for a classic twist.
- Glazed Lemon Loaf: Divide the batter between two 9×5-inch loaf pans and bake for 40-50 minutes, or until a skewer comes out clean.
- Extra Tangy Icing: Add a teaspoon of finely grated lemon zest to the icing for even more lemon flavor.
- Dairy-Free: Substitute a plant-based butter and non-dairy milk (plus lemon juice for acidity) to make a dairy-free version.
Storage and Reheating
This lemon sheet cake keeps well covered at room temperature for up to 2 days. For longer storage, cover tightly with plastic wrap or transfer slices to an airtight container and refrigerate for up to 5 days. To freeze, wrap individual slices or the whole (un-iced) cake tightly in plastic wrap and aluminum foil, and freeze for up to 2 months. Thaw overnight in the refrigerator and bring to room temperature before icing and serving.
If you prefer your cake warm, reheat individual slices in the microwave for 10-15 seconds. Avoid reheating the whole cake, as this can dry it out or melt the icing unevenly.
Frequently Asked Questions
- Can I use bottled lemon juice instead of fresh?
- Fresh lemon juice is highly recommended for the best flavor and aroma. Bottled juice can taste flat or slightly bitter. If you must use bottled, choose one without preservatives or additives, but expect a less vibrant lemon taste.
- Can I make this cake in advance?
- Yes! You can bake the cake a day ahead, cool it completely, and cover it tightly. Ice it on the day you plan to serve for the freshest taste and best texture. If you need to prepare further ahead, freeze the un-iced cake and thaw before icing and serving.
- How do I prevent my cake from sticking to the pan?
- Grease the pan well with butter or nonstick spray, and line the bottom with parchment paper. This ensures easy release and clean slices, especially important for a moist cake like this.
- Can I double the recipe for a larger crowd?
- Doubling the recipe is possible but requires two 9×13 pans for even baking. Avoid baking a double batch in a single pan, as it will not cook through evenly and may overflow. Bake both pans side by side, rotating halfway through if your oven has hot spots.
- What’s the best way to zest lemons?
- Use a microplane or fine grater, and zest only the outer yellow skin. Rotate the lemon as you work to avoid the bitter white pith. Zest the lemons before juicing them for efficiency.
- Why does my icing look too thin or too thick?
- If your icing is too thin, add more powdered sugar a tablespoon at a time. If it’s too thick, add extra lemon juice, a teaspoon at a time, until you reach a smooth, pourable consistency. Temperature and humidity can affect icing thickness, so adjust as needed.