Old-Fashioned Lemon Pie Sheet Cake is a tender vanilla butter sheet cake topped with a thick layer of old-fashioned lemon pie filling and a soft blanket of whipped cream. It’s the kind of chilled cake I reach for when I want something bright, clean, and not fussy to serve.
The cake itself is soft and buttery with a little lemon in the background, and the filling is that classic smooth, tangy custard that sets up nicely in the fridge. I like this version because you get the lemon-pie feel, but in a neat, sliceable sheet cake that holds up well on a dessert table.
I usually serve it cold for clean slices, especially for cookouts, holidays, and any time you need a make-ahead dessert that still feels special. A few lemon slices on top look nice, but it’s great even with nothing extra.
Why You’ll Love This Recipe
True lemon-pie flavor: The filling is a real stovetop lemon pie filling, thick and tangy, not just a quick glaze.
Easy to slice and serve: A 9×13 cake is simple for parties, and chilling it makes the pieces come out clean.
Great make-ahead dessert: This is one of those cakes that honestly gets better after a good chill in the fridge.
Soft butter cake base: The vanilla-butter cake stays tender under the filling and doesn’t get weird or soggy.
That whipped cream finish: The light topping keeps the whole thing from feeling heavy, even after a big meal.
Ingredients You’ll Need
Cake
- All-purpose flour: I use regular all-purpose flour here. Spoon and level if you tend to pack flour into the cup.
- Granulated sugar: Simple white sugar is what I stick with for a clean vanilla cake flavor.
- Baking powder: This gives the sheet cake its lift. Make sure it’s fresh so the cake rises evenly.
- Fine salt: Don’t skip it. It keeps the cake from tasting flat and helps the lemon pop.
- Unsalted butter: Softened butter creams better and gives you that classic butter cake texture.
- Eggs: Room temp eggs mix in more smoothly, so the batter doesn’t look curdled.
- Whole milk: Whole milk makes a more tender crumb. Lower-fat milk works, but the cake can bake up a little drier.
- Vanilla extract: Use real vanilla if you can since it’s the main flavor in the cake base.
- Lemon zest: This adds lemon aroma without making the cake sour. Zest the lemon before you juice it.
Lemon Pie Filling
- Granulated sugar: This sweetens the custard and keeps it tasting like classic lemon pie filling.
- Cornstarch: This is what thickens the filling so it sets nicely on the cake after chilling.
- Fine salt: Just a little helps keep the filling from tasting one-note sweet.
- Water: The base liquid for the custard. It sounds plain, but it’s exactly how old-fashioned pie fillings are often built.
- Egg yolks: These make the filling richer and give it that pie-filling texture. Save the whites for another recipe.
- Fresh lemon juice: Fresh is best here. Bottled juice can taste a bit dull or harsh.
- Lemon zest: Zest makes a big difference in the lemon flavor, so I use it in the filling too.
- Unsalted butter: A few tablespoons at the end smooth everything out and makes the custard taste finished.
Whipped Topping
- Heavy whipping cream: Keep it cold so it whips up quickly and holds its shape.
- Powdered sugar: This sweetens the whipped cream without feeling gritty.
- Vanilla extract: Just enough to make the topping taste like more than plain cream.
- Lemon slices: Optional, but nice if you want a simple garnish for the pan or individual pieces.
Recipe Instructions
- Preheat the oven: Heat the oven to 350°F and grease a 9-inch by 13-inch baking pan.
- Mix the dry ingredients: Whisk the flour, sugar, baking powder, and salt together in a mixing bowl.
- Beat the butter: Beat the softened butter until smooth and creamy.
- Add the eggs: Beat in the eggs one at a time, mixing after each one until combined.
- Add the milk and flavorings: Mix in the milk, vanilla extract, and lemon zest.
- Add the dry ingredients: Add the flour mixture and mix just until the batter is smooth.
- Bake: Spread the batter evenly in the pan and bake for 28 to 32 minutes, until a toothpick comes out clean.
- Cool the cake: Let the cake cool completely in the pan.
- Start the filling: Whisk the sugar, cornstarch, and salt in a saucepan, then whisk in the water until smooth.
- Thicken the filling: Cook over medium heat, whisking constantly, until the mixture is thick and bubbling.
- Temper the yolks: Whisk the egg yolks in a bowl, then slowly whisk in about 1/2 cup of the hot mixture.
- Cook the yolks: Pour the tempered yolks into the saucepan and cook for 1 minute, whisking the whole time.
- Finish the filling: Remove from heat and whisk in the lemon juice, lemon zest, and butter until smooth.
- Spread and chill: Cool the filling for 10 to 15 minutes, spread it over the cooled cake, then refrigerate until set, at least 2 hours.
- Whip the topping: Whip the heavy cream, powdered sugar, and vanilla to soft peaks.
- Top and serve: Spread or pipe the whipped cream over the chilled cake, garnish with lemon slices if you want, then slice cold for clean pieces.
Some of my tips!
This is the part that really makes a difference. If you only read one section, make it this one because this is where I share the little trick that helps the recipe turn out so well.
Recipe Tips & Tricks
Let the cake cool all the way. If the cake is even a little warm, the filling can loosen up and slide around instead of sitting in a neat layer.
Whisk the filling constantly. Once the cornstarch mixture starts to heat, it thickens fast. Steady whisking keeps it smooth and helps prevent lumps.
Go slow when tempering the yolks. A thin stream of the hot mixture is all you need. If you dump it in, the yolks can scramble and you’ll lose that silky custard texture.
Cool the filling briefly before spreading. I like that 10 to 15 minute rest so it’s still spreadable but not piping hot. It’s easier to get an even layer that way.
Whip to soft peaks, not stiff. Soft peaks spread more nicely and stay creamy. If you go too far, the whipped cream can start looking a little grainy.
Make some touches!
There are plenty of easy ways to serve this depending on the occasion. Keep it simple, or add a few small touches to make it feel a little more special.
Serving Suggestions
- Fresh berries: A handful of strawberries or blueberries on the side is really nice with the lemon. It also makes the plate look a little more finished without extra work.
- Iced tea: This cake is especially good with unsweetened iced tea or lightly sweet tea. The lemon and tea just make sense together.
- Extra lemon zest: If you want it a little brighter, zest a bit of lemon over the whipped cream right before serving. It’s simple, but it adds a lot.
- Shortbread cookies: A small shortbread cookie on the plate is great if you want something crisp with the soft cake and custard.
Save it for later
This section covers how to store leftovers and what parts of the recipe you can prepare ahead of time.
Storage and Make Ahead
Store leftovers covered in the refrigerator up to 4 days. Since it has custard-style filling and whipped cream, this one belongs in the fridge.
You can make this recipe ahead pretty easily. I like baking the cake and adding the lemon filling the day before, then doing the whipped cream closer to serving.
If you want to freeze it, I’d suggest freezing individual slices without the whipped cream when possible. Thaw in the fridge overnight, then add fresh whipped cream before serving.
A few quick answers
This section covers a few extra details that may help before you head to the recipe card.
Recipe FAQs
Can I use lemon curd instead of homemade lemon pie filling?
Yes. If you want a shortcut, use about 1 1/2 cups prepared lemon curd. It’ll be a little richer and sometimes a bit softer than the cooked filling, but it works well once the cake is chilled.
Why does my lemon filling have little lumps?
That usually happens if the heat is a little high or the yolks weren’t tempered slowly enough. Constant whisking helps a lot, and keeping the heat at medium (not high) makes it easier to control.
Do I have to chill the cake before slicing?
I really recommend it. The filling needs time to set, and the chilled cake slices cleaner and stacks better on a plate. If you cut it too early, the filling can smear and look messy.
Can I add more lemon flavor?
You can. Add more zest to the cake batter, or stir about 1 tablespoon of lemon zest into the whipped cream. I wouldn’t add extra lemon juice to the filling unless you also adjust the thickener, because it can end up too loose.
Can I use low-fat milk in the cake?
You can, but expect the crumb to be a little drier. Whole milk is my preference here, especially since the cake is the base for a chilled dessert.
You might also like
Before you go, take a look at a few other recipes below the recipe card. They use similar ingredients in a different way and are worth saving too.
MORE DINNER RECIPES TO TRY
Old-Fashioned Lemon Pie Sheet Cake
INGREDIENTS
Cake
- 2 cups all purpose flour
- 1 1 2 cups granulated sugar
- 2 tsp baking powder
- 1 2 tsp fine salt
- 1 2 cup unsalted butter softened
- 3 large eggs room temperature
- 1 cup whole milk
- 2 tsp vanilla extract
- 1 tbsp lemon zest.
Lemon Pie Filling
- 1 cup granulated sugar
- 1 4 cup cornstarch
- 1 4 tsp fine salt
- 1 1 2 cups water
- 4 large egg yolks
- 1 2 cup fresh lemon juice
- 2 tbsp lemon zest
- 3 tbsp unsalted butter.
Whipped Topping
- 1 cup heavy whipping cream cold
- 3 tbsp powdered sugar
- 1 tsp vanilla extract
- lemon slices for garnish optional.
INSTRUCTIONS
Bake Cake
- Heat oven to 350 F and grease a 9 inch by 13 inch baking pan
- whisk flour sugar baking powder and salt in a bowl
- beat butter until smooth then beat in eggs one at a time
- mix in milk vanilla and lemon zest
- add dry ingredients and mix just until smooth
- spread batter evenly in pan and bake until a toothpick comes out clean 28 to 32 minutes
- cool cake completely in pan.
Make Filling
- Whisk sugar cornstarch and salt in a saucepan then whisk in water until smooth
- cook over medium heat whisking constantly until thick and bubbling
- whisk egg yolks in a bowl then slowly whisk in 1 2 cup hot mixture to temper
- pour tempered yolks into saucepan and cook 1 minute whisking
- remove from heat and whisk in lemon juice lemon zest and butter until smooth
- cool filling 10 to 15 minutes then spread over cooled cake
- refrigerate until set at least 2 hours.
Top and Serve
- Whip cream powdered sugar and vanilla to soft peaks then spread or pipe over chilled cake
- garnish if desired and slice cold for clean pieces.
