Fluffy lemon yogurt cake is topped with a punchy, silky lemon curd Swiss meringue buttercream. This sheet cake is perfect for feeding a crowd
Hi hi! Happy Thursday! Apologies for things being a little quiet around here - we are heading back to NZ in a few weeks for a holiday so there’s a lot to organise before we go.
I made this Lemon Yogurt Sheet Cake a while back, and semi forgot that it was hiding in my recipe notebook / photo folders, so it was more than a pleasant surprise when I came across it!
It’s pretty simple - the cake itself is your standard lemon yogurt situation. It comes together with two bowl and a whisk. I have this weird thing about washing the bowl and mixing attachment of my stand mixer, so bowl and whisk recipes are my current favourite! Everything gets stirred together and spread into a 9x13 pan, and baked up to lemony yogurt perfection. You could stop there and finish it just with a dusting of powdered sugar, but I figured that seeing as the cake is so simple, we could go a little extra on the buttercream.
I finished the cake off with a Lemon Curd Swiss Meringue Buttercream - which is just a Swiss Meringue Buttercream with cooled Lemon Curd incorporated into it once the mixing process has finished. Lemon Curd buttercream is a favourite of mine. It is still punchy, but the acidity of the curd is tamed by the buttercream, while still letting the lemon flavour shine through. The cake is perfect without, but it’s extra special with.
A few wee tips:
- The lemon curd needs time to cool, so make sure that you allow time for that! I like to make it the day before if I can, or at least before starting to bake the cake so that it has time to bake before making the buttercream.
- I like to make the lemon curd in a double boiler setup on the stove. I prefer to use a stainless steel mixing bowl for the double boiler - it goes much faster than a glass bowl.
- I have this pan which I use for sheet cakes and I love it - it is super non stick and the sides are nice and straight.
- This makes a pretty chunky cake, so make sure you cut it into smaller pieces when serving (the ones I cut for styling were massive)
- I used some yellow non pareils and then this mix to finish the cake!
Lemon Yogurt Sheet Cake with Lemon Curd Swiss Meringue Buttercream. Fluffy lemon yogurt cake is topped with a punchy, silky lemon curd Swiss meringue buttercream. This sheet cake is perfect for feeding a crowd.
Lemon Yogurt Sheet Cake
- 600g all-purpose flour
- 400g granulated sugar
- 1 ½ tsp baking powder
- 1 ¾ tsp baking soda
- 1 tsp salt
- 6 eggs, at room temperature
- 280g neutral oil
- 300g freshly squeezed lemon juice
- 350g greek yogurt
- 1 tsp vanilla bean paste
- 120g lemon juice
- Zest of 2 lemons
- 100g sugar
- 6 egg yolks
- 70g unsalted butter, cold from the fridge is fine, cut into cubes
Lemon Curd Swiss Meringue Buttercream
- 125g egg whites, at room temperature
- 200g granulated sugar
- ¼ tsp kosher salt
- 455g unsalted butter, cold and cut into small pieces
- 1 tsp vanilla bean paste
- Lemon Curd
LEMON YOGURT SHEET CAKE
- Preheat the oven to 350°f /180°c. Grease and line a 9”x13” baking pan with parchment paper, extending the parchment paper over the sides slightly to form a sling.
- In a large bowl, combine flour, sugar, baking powder, baking soda and salt. Whisk until well combined.
- In a medium bowl, whisk together the eggs, oil, lemon juice, yogurt and vanilla bean paste. Add the wet ingredients to the dry ingredients, and whisk well to to combine, then switch to a silicone spatula and mix until incorporated.
- Transfer the mixture to the prepared pan and bake for 40 to 50 minutes, or until a skewer or tester inserted into the middle comes out clean.
- Allow to cool completely in the pan, then using the parchment paper, transfer to a serving platter.
- Place a medium heatproof bowl over a pot of simmering water, ensuring that the water does not touch the bottom of the bowl. Combine all of the ingredients in the mixing bowl and whisk together.
- Heat, stirring often, until mixture is thick enough that when you coat the back of a spoon or spatula with curd, you can drag a finger through it, and leave a clear track. Watch the edges of the mixture carefully to ensure that it does not catch and go lumpy, switching to a flexible rubber spatula as needed to help clear the sides of the bowl. Once it is at this point, continue to cook for a further 5 minutes. It will thicken more when it cools. Transfer to a bowl or container, straining through a sieve if you can see any small pieces of egg, then press a piece of plastic wrap directly against the surface of the curd. Place in the fridge to cool completely.
LEMON CURD SWISS MERINGUE BUTTERCREAM
- Place the egg whites, sugar and salt in the bowl of a stand mixer or a heat proof bowl. Place over a pot of simmering water, ensuring that the water does not touch the bowl. Heat, whisking constantly, until the mixture registers 160˚f (70˚c) on a thermometer and the sugar has dissolved.
- Carefully transfer the bowl to the mixer, and fit with the whisk attachment. Whip the egg whites on high until they are white and fluffy, 5-6 minutes. Add the butter one chunk at a time, mixing until incorporated (the mixture may look curdled - but just keep mixing, as it will come together). Once all the butter is incorporated, mix on high for a further 3 minutes. Add the vanilla and lemon curd and mix until incorporated.
- Transfer the buttercream to the top of the cake using a spatula, then evenly spread over the surface of the cake using an offset spatula, creating swoops as desired. Finish with sprinkles as desired.
- Store leftovers in an airtight container in the fridge.
Keywords: lemon, lemon yogurt, sheet cake, lemon curd, Swiss meringue buttercream