Custard Lemon Pie Cake is a moist lemon sheet cake with a creamy lemon custard layer baked right in. It’s the kind of dessert that scratches the itch for lemon bars and lemon cake at the same time.
I like this version because it’s bright and lemony, but still feels rich and soft. The custard bakes up smooth and sliceable, and the top stays tender like a pudding cake in the best way.
This is one of my go-to desserts when I want something that looks a little special in a 9×13 pan. I usually serve it chilled with powdered sugar and a little whipped cream, especially for spring lunches and weekend get-togethers.
Why You’ll Love This Recipe
One-pan dessert: You get cake and custard in one bake, and it still slices neatly once it’s chilled.
Bright lemon flavor: Fresh lemon juice and zest give it that real lemon bite that boxed lemon desserts usually miss.
Soft, creamy layers: The cake stays moist, and the cream cheese custard bakes into a creamy middle that feels like lemon pie.
Make-ahead friendly: I actually prefer it after it’s had a couple hours in the fridge, so it’s easy to plan for.
Easy to dress up: Powdered sugar, whipped cream, and lemon slices make it look finished with almost no effort.
Ingredients You’ll Need
Pan and finishing
- Nonstick cooking spray: I still grease well even with a nonstick pan. This cake is tender and you want clean slices.
- All purpose flour – Just a light dusting over the spray helps the custard-y edges release without sticking.
- Powdered sugar: This is the easiest finishing touch, especially if you’re serving it chilled.
- Whipped cream: Optional, but really nice with the tangy lemon custard. Homemade or the tub works.
- Lemon slices: Totally for looks, but they’re a nice hint of what’s inside.
Lemon cake batter
- Yellow cake mix: I use a standard box here. It bakes up soft and gives the dessert some structure under the custard.
- Instant vanilla pudding mix: Don’t skip it. It helps the cake stay moist and gives it that slightly thicker, plush texture.
- Eggs: Bring them to room temp if you can. The batter mixes smoother and bakes more evenly.
- Sour cream: This is what keeps the cake from tasting flat. Full-fat sour cream is best.
- Vegetable oil: Keeps the crumb soft even after chilling. Any neutral oil works.
- Water: Plain water is fine here to loosen the batter without adding extra flavor.
- Fresh lemon juice: Fresh is best here. Bottled can taste a little sharp and dull at the same time.
- Lemon zest: This adds the “real lemon” flavor more than juice does. Zest it before you juice the lemons.
- Vanilla extract: Just a little rounds out the lemon and keeps it tasting like cake, not lemonade.
- Salt: Small amount, big difference. It keeps the sweetness in check.
Lemon custard layer
- Cream cheese: Use full-fat and make sure it’s softened, otherwise you’ll fight lumps.
- Granulated sugar: Sweetens the custard and helps it bake up smooth.
- Eggs: These set the custard. Mix in just until combined so it stays creamy.
- Whole milk: Whole milk makes a more stable custard. Lower-fat milk can work, but it’s a little less rich.
- Fresh lemon juice: Adds that lemon-pie tang in the custard layer. Fresh is worth it here.
- Lemon zest: More zest here keeps the custard tasting bright even when the cake is cold.
- Vanilla extract: A little vanilla keeps the cream cheese flavor from tasting too sharp.
Recipe Instructions
- Preheat the oven: Heat the oven to 350°F. Grease a 9×13-inch baking pan with nonstick spray and dust lightly with flour. If you have time, bring the eggs and cream cheese to room temperature.
- Mix the dry ingredients: Whisk the cake mix and instant pudding mix together in a large bowl.
- Mix the cake batter: Add the eggs, sour cream, oil, water, lemon juice, lemon zest, vanilla, and salt. Beat until smooth and slightly thick, about 2 minutes.
- Add the batter: Pour about two thirds of the cake batter into the prepared pan and spread it out evenly.
- Beat the cream cheese: In a separate bowl, beat the softened cream cheese and sugar until smooth.
- Mix the custard: Beat in the eggs, then add the milk, lemon juice, lemon zest, and vanilla. Mix just until combined.
- Add the custard: Pour the custard evenly over the cake batter in the pan.
- Add the remaining batter: Spoon the remaining cake batter over the top in dollops.
- Swirl: Gently swirl the top with a knife to get a marbled look, but don’t swirl so much that the layers disappear.
- Bake: Bake for 45 to 55 minutes, until the center is set and a toothpick inserted into the cake portion comes out with a few moist crumbs. If it’s browning early, tent loosely with foil for the last 10 to 15 minutes.
- Cool: Cool in the pan for 1 hour, then refrigerate for at least 2 hours so the custard firms up and you get clean slices.
- Serve: Dust with powdered sugar and serve chilled or at cool room temperature, with whipped cream and lemon slices if you like.
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
Use softened cream cheese. If it’s still cool in the middle, it tends to leave little lumps in the custard. I usually let it sit out for 30 to 60 minutes.
Don’t over-swirl the top. A few gentle passes is enough. If you mix too much, you’ll lose that custard layer and it just bakes like a plain lemon cake.
Watch the center, not the edges. The edges can look done first, but the middle needs to be set for the custard to slice. A toothpick test in the cake portion helps.
Tent with foil if needed. If the top is getting too brown before the center sets, a loose piece of foil fixes it fast.
Try a little lemon curd. Swapping a couple tablespoons of the custard’s lemon juice for lemon curd gives a deeper lemon flavor. I keep it small so the custard still sets well.
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
- Whipped cream: A spoonful on each square is simple and really good with the tangy custard. I like it lightly sweetened.
- Fresh berries: Blueberries or raspberries are easy with lemon and make the plate look nice. I usually add them right before serving.
- Powdered sugar: Dust right before you serve so it stays bright white. It’s enough on its own if you want to keep it simple.
- Tea: This is great with hot tea, especially Earl Grey or a plain black tea. It’s also good with iced tea when it’s warm out.
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 fridge for up to 4 days. The custard layer is happiest cold, and the slices hold together better that way.
If you want to make this recipe ahead, bake it the day before and keep it refrigerated. I wait to add powdered sugar until right before serving.
You can also freeze individual portions if you want them to last longer. Thaw in the fridge overnight, then serve chilled or let it sit out for a few minutes.
A few quick answers
This section covers a few extra details that may help before you head to the recipe card.
Recipe FAQs
Do I have to chill it before slicing?
For clean slices, yes. The custard layer firms up a lot in the fridge, and it’s much easier to cut into neat squares.
How do I know it’s done if there’s custard in the middle?
I look for a set center (it shouldn’t jiggle like liquid) and use a toothpick in a cake-heavy spot, not straight into the custard. You want a few moist crumbs from the cake portion.
Can I use low-fat cream cheese or milk?
I wouldn’t if you can help it. Full-fat cream cheese and whole milk make the custard more stable and creamy, and it’s less likely to bake up thin.
Can I add more lemon flavor?
Yes. Add a little extra zest, or swap 2 to 3 tablespoons of the custard’s lemon juice for lemon curd. I don’t add a lot more liquid juice than the recipe calls for because it can loosen the custard.
What’s the best way to serve it?
I like it chilled or just slightly cool, dusted with powdered sugar. Whipped cream is great on top, and a thin lemon slice makes it look finished.
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
Custard Lemon Pie Cake
INGREDIENTS
Pan and finishing
- nonstick cooking spray
- 1 tbsp all purpose flour for dusting
- powdered sugar for topping
- whipped cream for serving
- lemon slices for garnish.
Lemon cake batter
- 1 box yellow cake mix 15.25 oz
- 1 box instant vanilla pudding mix 3.4 oz
- 4 large eggs
- 1 cup sour cream
- 1 2 cup vegetable oil
- 3 4 cup water
- 1 4 cup fresh lemon juice
- 1 tbsp lemon zest
- 1 tsp vanilla extract
- 1 4 tsp salt.
Lemon custard layer
- 8 oz cream cheese softened
- 1 2 cup granulated sugar
- 2 large eggs
- 1 2 cup whole milk
- 1 3 cup fresh lemon juice
- 1 tbsp lemon zest
- 1 tsp vanilla extract.
INSTRUCTIONS
Prep
- heat oven to 350 F
- grease a 9x13 inch baking pan and dust lightly with flour
- bring eggs and cream cheese to room temperature for smoother mixing.
Mix lemon cake batter
- whisk cake mix and pudding mix in a large bowl
- add eggs sour cream oil water lemon juice lemon zest vanilla and salt
- beat until smooth and slightly thick about 2 minutes
- pour about two thirds of the batter into the prepared pan and spread evenly.
Make custard and assemble
- beat cream cheese and sugar until smooth
- beat in eggs then milk lemon juice lemon zest and vanilla just until combined
- pour custard evenly over the batter
- spoon remaining cake batter over the top in dollops and gently swirl to create a marbled top without fully mixing layers.
Bake and set
- bake until the center is set and a toothpick inserted into the cake portion comes out with a few moist crumbs 45 to 55 minutes
- cool in pan 1 hour then refrigerate at least 2 hours for clean slices and a firmer custard layer
- dust with powdered sugar and serve chilled or at cool room temperature.
