Zesty Lemon Curd Layer Cake Recipe

This is the best lemon curd cake — a simple 9″ snack cake that’s tender, moist, and bursting with citrus. It’s finished with a silky lemon cream cheese buttercream and generous swirls of homemade lemon curd for an extra punch of bright lemon flavor. Easy to make and perfect for spring or anytime you’re craving a fresh, lemony dessert.

What makes this Lemon Curd Cake the best?

Punchy lemon flavor throughout. Lemon appears in the cake batter, the cream cheese buttercream, and the curd. This recipe uses fresh lemon juice and zest plus a touch of lemon extract so the citrus flavor is clear and bright.
Soft, moist crumb. A combination of butter, oil, and sour cream produces a tender, moist texture that keeps well.
Silky lemon cream cheese buttercream. Tangy cream cheese balances the sweetness while lemon zest and juice sharpen the flavor for a smooth, spreadable frosting.
Simple to prepare. The cake comes together quickly, the buttercream uses just a few ingredients, and while homemade lemon curd is optional, it’s easy to make and worth the effort for maximum lemon intensity.

Ingredients

Lemons. Plan to use several lemons for zest and juice — about 7–8 total for homemade curd plus cake and frosting. If you use store-bought curd, you’ll need fewer.
Butter & oil. Butter adds flavor while oil keeps the cake extra moist.
Sugar. Granulated sugar for the cake (rubbed with lemon zest) and powdered sugar for the frosting.
Eggs. The cake uses whole eggs; the curd uses extra yolks for a rich texture.
Lemon extract paste or extract. Optional but useful for amplifying lemon flavor.
Cornstarch. Helps keep the cake light and tender.

How to make Lemon Curd Cake

Make the lemon curd

You can use store-bought lemon curd if you prefer, but homemade curd delivers a fresher, brighter flavor. Combine sugar, egg yolks, whole eggs, salt, lemon juice, and lemon zest in a medium saucepan. Cook over medium heat, whisking constantly for about 5 minutes, until the mixture bubbles and thickens enough to coat the back of a spoon. Remove from heat, stir in the butter, then strain through a fine-mesh sieve for a silky texture. Press plastic wrap against the surface to prevent a skin from forming, and chill; the curd will thicken as it cools.

Make the lemon cake

Preheat the oven to 350°F (175°C) and line a 9″ square pan with parchment, leaving an overhang so you can lift the cake out once cooled. In a mixer bowl, rub the lemon zest into the granulated sugar to release oils and infuse the sugar with citrus. Add butter and oil and beat until light and combined.

In separate bowls, whisk together the dry ingredients (flour, cornstarch, baking powder, baking soda, and salt) and combine the wet liquids (lemon juice, vanilla, lemon extract, water, and sour cream). Add eggs to the sugar mixture one at a time, then alternate adding the dry and wet mixtures, starting and ending with the dry. Finish with a gentle fold by hand to ensure an even batter, pour into the prepared pan, and bake 28–30 minutes or until a toothpick inserted in the center comes out mostly clean with a few moist crumbs. Cool completely before frosting.

While the cake cools, make the frosting: beat cream cheese and butter until smooth and airy, then add powdered sugar in two additions, mixing on low speed. Stir in fresh lemon zest, then add lemon juice a tablespoon at a time until you reach a silky, spreadable consistency.

Assemble the cake

Spread the lemon cream cheese buttercream over the cooled cake. Drop spoonfuls of lemon curd across the top and use an offset spatula or the back of a spoon to swirl the curd into the frosting for decorative streaks. Finish with extra lemon zest and slice into 9 or 16 squares. Wipe the knife between cuts for clean slices. Serve at room temperature.

Tools & Equipment

9″ square baking pan — light-colored metal pans give even browning.
Stand mixer or hand mixer — helpful for creaming and for the buttercream.
Kitchen scale — weighing ingredients improves consistency.
Offset spatula — useful for spreading and swirling the frosting.
Parchment paper — makes removing the cake easy.
Citrus zester — you’ll use zest in the cake, frosting, and curd.

Lemon Curd Cake FAQs

Can I buy lemon curd? Yes — store-bought curd works if you’re short on time. Homemade curd is fresher and has a brighter flavor.
Can I make this cake gluten free? The recipe hasn’t been tested with gluten-free flour, but a reliable 1:1 gluten-free flour blend may work.
How do I get silky frosting? Mix powdered sugar on low speed and add lemon juice gradually. Slightly warming the lemon juice (just until warm, not hot) can help thin the frosting for a smoother finish.

Description

Soft, moist, and citrusy lemon snack cake topped with silky lemon cream cheese frosting and swirls of lemon curd. Bright, tender, and ideal for gatherings or a simple afternoon treat.

Ingredients

For the Lemon Cake

1 1/4 C (260g) granulated sugar
1 1/2 TBSP lemon zest (from about 2 lemons)
1/3 C (80g) vegetable oil
5 1/2 TBSP (80g) salted butter, room temperature
3 large eggs, room temperature
2 C (250g) all-purpose flour
2 TBSP cornstarch
2 tsp baking powder
1/4 tsp baking soda
Pinch of salt
1/3 C (70g) fresh lemon juice
1 tsp vanilla extract
1/2 tsp lemon extract paste or regular lemon extract (optional)
1/3 C + 2 tsp (90g) water, room temperature
1/4 C (70g) sour cream, room temperature

For the Lemon Cream Cheese Buttercream

8 oz (1 block) full-fat cream cheese, room temperature
1/2 C (113g) butter, room temperature
4 C (460g) powdered sugar
1 TBSP fresh lemon zest
2–4 TBSP fresh lemon juice, to taste

For the Lemon Curd

200 g granulated sugar
6 large egg yolks
2 large whole eggs
1/2 tsp salt
3 tsp lemon zest
2/3 C fresh lemon juice
6 TBSP salted butter

Instructions

For the Lemon Cake

Preheat oven to 350°F and line a 9″ square pan with parchment paper.
Rub lemon zest into the granulated sugar, then beat in butter and oil until light and combined.
Add eggs one at a time, mixing until incorporated.
Whisk together flour, cornstarch, baking powder, baking soda, and salt in a separate bowl.
Whisk lemon juice, vanilla, lemon extract, water, and sour cream together in a liquid measuring cup.
Alternate adding the dry and wet ingredients to the batter, starting and ending with the dry. Finish folding by hand to ensure even mixing.
Pour batter into the prepared pan and bake 28–30 minutes, until a toothpick comes out mostly clean with a few moist crumbs. Cool completely.

For the Lemon Cream Cheese Buttercream

Cream butter and cream cheese on medium-high speed until smooth and airy, stopping to scrape the bowl every few minutes.
Add powdered sugar in two additions, mixing on low speed after each.
Mix in lemon zest and add lemon juice 1 TBSP at a time until you reach the desired consistency.

For the Lemon Curd

Combine sugar, egg yolks, whole eggs, salt, lemon juice, and zest in a saucepan and cook over medium heat, whisking constantly for about 5 minutes until thickened and bubbling.
Remove from heat, stir in butter, then strain through a fine-mesh sieve for a smooth curd.
Press plastic wrap against the surface and chill until ready to use.