Lemon Sheet Cake

If you’re looking for an easy lemon cake recipe, look no further! This super moist and delicious Lemon Sheet Cake recipe topped off with a tasty lemon buttercream frosting is our new favorite dessert, and it’s perfect for feeding a crowd!

Of all the lemon cakes I have recipes for, this just might be the easiest of them all! It’s moist just like our lemon buttermilk cake, and has a delicious frosting like our lemon bundt cake. Try for yourself!

Moist Lemon Cake on a white plate

a lemony dessert for spring & summer

Helloooooooooooo! It’s me, Lily again! Did you miss me? I know… it seems like a long time since the last time I posted. 😉 Spring time makes me think of fruit and lemons and the dessert we are sharing today. It’s Lemon Sheet Cake!

This lemon cake is one of the easiest lemon cake recipes you will ever make!

The reason why it’s so easy is because we used a lemon cake mix that came out of a box! It also has pudding mix in it, which makes it so good. There were only a few other ingredients we put in the cake besides those.

The best part is the lemon buttercream frosting on top. This lemon cake is SO delicious and creamy!! I already told my mom I want to make this again. I think it’s the perfect dessert for Spring and for Summer!!

Lemon Cake Frosting in a mixing bowl

Check out that creamy lemon frosting!!

How to Make Lemon cake:

The reason this is an EASY lemon cake is because it’s not made totally from scratch. You actually use a box mix plus some instant pudding and buttermilk.

MIX. Combine cake mix and pudding mix in a bowl. Then add the ingredients listed on the cake box and the buttermilk. Beat with a hand mixer until well combined.

Note: Make sure when you select a cake mix that it is a regular mix and doesn’t already include pudding. If you can’t find white chocolate pudding mix, you can substitute vanilla flavored instant pudding mix. And if you prefer sugar free pudding, that works just fine!

BAKE. Pour cake batter into a 9×13 cake pan and bake at 350° for 23-25 minutes.

Using different sized pans: If you are going to use a pan bigger than a 9×13, or a jelly roll pan, the estimated cook time is about 17-20 minutes. We love to make the cake a little more thin and use an 11×15 pan to get more slices out of it.

For smaller sized pans and circle pans, it will need to cook a little longer. The estimated cook time is for 35-40 minutes or until a toothpick that is poked into the center comes out clean.

How to make lemon frosting:

Start by creaming together the butter and cream cheese. Add the powdered sugar, vanilla, lemon jello mix, lemon juice, lemon zest and milk. Beat until the frosting is creamy and smooth. And that’s it! Easy peasy.

Lemon zest?? Making lemon zest is very simple. You can use a grater or a traditional zester. Be sure to do this before juicing the lemon because it makes it a lot easier, and wash the lemon before starting! Simply rub the lemon against the blades of the grater or zester, making sure you’re only grating the outermost peel of the lemon.

homemade lemon cake with lemon frosting on a white plate

Making ahead + Storing

Making ahead: There are a couple of options for doing this. You can assemble the cake completely and cover the top with a lid or plastic wrap and leave it in the fridge. Then, take it out of the fridge 2 hours before it’s served to let it come to room temperature.

To avoid any chances of the cake drying out from sitting in the fridge overnight, you can store it (without frosting) covered with plastic wrap, at room temperature.

You can make the frosting right before serving, or if you make it beforehand store the frosting in the fridge in an airtight container. Take it out 2 hours before frosting the cake so it can come to room temperature and go on smoothly.

Storing: To store the leftovers, cover the pan with plastic wrap and store in the fridge for 5-6 days. Take it out of the fridge a while before you serve to give the frosting time to get to room temperature. I wouldn’t suggest storing this cake at room temperature for longer than 8 hours because of the cream cheese in the frosting.

This cake is perfect for the ultimate lemon fan. I haven’t always loved lemon, but I DO love this cake. It’s so delicious and so moist!

And for more lemon treats, check out:

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Lemon Sheet Cake Recipe

4.53 from 17 votes
This super moist and delicious Lemon Sheet Cake recipe topped off with a tasty lemon buttercream frosting is our new favorite dessert, and it's perfect for feeding a crowd!
Course Dessert
Cuisine American
Prep Time 10 minutes
Cook Time 25 minutes
Total Time 35 minutes
Servings 24
Calories 174 kcal
Author Lil' Luna



  • 1 box lemon cake mix plus ingredients on box
  • 1 cup buttermilk
  • 3 oz white chocolate instant pudding mix


  • 1/4 cup butter softened
  • 4 oz cream cheese softened
  • 2 cups powdered sugar
  • 2 tbsp lemon jello mix
  • 1 tsp vanilla
  • 1 tbsp lemon juice you can use more if you want more lemon taste
  • 2-3 tsp lemon zest
  • 1-2 tbsp milk


  • Preheat oven to 350.
  • Add lemon cake mix and pudding mix to a medium bowl.
  • Add buttermilk plus the ingredients on the back of the cake mix box and beat until well combined.
  • Pour into a greased 9x13 pan. Bake for 23-35 minutes (or for more slices and thinner cake, use an 11x15 pan and bake for 18-20 minutes.
  • While cake is cooling make frosting by creaming together butter and cream cheese. Add powdered sugar, vanilla, jello mix, lemon juice, lemon zest and milk. Beat until smooth.
  • Frost cake and ENJOY!


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About the Author

Kristyn Merkley

My name is Kristyn and I’m the mom of SIX stinkin’ cute kids and the wife to my smokin’ hot hubby, Lo. My mom’s maiden name is Luna, and I’m one of the many crafty “Lil’ Lunas” in the fam. On this site I like to share all things creative - from recipes to home decor to gifts and home decor ideas. Welcome!

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      1. I think i know why cake fell & is heavy! Many cake MIXes have pudding mix alreafy in them, that would be double pudding mix!
        Use cakemix w/ out pudding already in the mix, just use plain caKe mix & then u can add pudding miX! Going to try it now!7

  1. 5 stars
    This recipe is excellent. I made it for work and everyone loved it and was gone quickly. I made it 2 days ago and now I’m making it again for my family. This is going to be a staple. I used the Duncan Hines lemon signature box of cake mix and the hershey’s brand of white chocolate pudding mix and did everything as directed in above recipe. I read the other comments and made sure to bake 35 minutes and came out perfectly. 25 minutes wasn’t long enough. I would highly recommend this recipe and normally dont comment but wanted to help others know this is a great cake.

  2. I thought a sheet Cake was cooked in an 11×14 pan…. is that why people’s cakes are falling? What size pan should I use?

      1. Hello! I am curious what your thoughts are trying a lemon pudding instead of the white chocolate? I want it to be super lemony!
        Thank you!


  4. 5 stars
    I FollOwed this recipe as recommended by one of the reviewerS with the duncan hines box of lemon cake with the Hersheys white chocolate pudding ! It came out perfecf ! I baked it in 2 9 inch pans for a round cake and had to bake it For About 40 minutes. It was delIcious and moiSt ! My husband and kids loved it ! For sure dont get a box of cake that already has pudding mix dded 🙂

  5. 4 stars
    I love this cake. I am still having problems with cook time and it collapsing in the middle when I remove it from oven. I used Duncan Hines lemon cake mix. Your directions say to use ingredients on back of box. Plus add 1 cup buttermilk and white chocolate pudding mix. The ingredients on back of cake mix are 1 cup water, 2 eggs and oil. I wonder if you use a different cake mix and don’t include 1 cup of water and 1 cup of buttermilk. Also with your pan size, the chocolate sheet cake recipe calls for a 10 X 14 jelly roll pan. For lemon cake you say 9 x 13. Just want to clarify as I am doing something wrong. I baked it for 35 minutes. Beautiful. 10 minutes later it fell in meddle.

    1. I can’t remember what mix I used, but they should all be similar & yes, I did use all the ingredients. This cake is in the 9×13 🙂 I’m really not sure what made it fall?? I’m sorry it did! Did you add the pudding mix?

  6. Do do you think it makes a difference if I use a cake mix that says that already has pUdding in it?

  7. 4 stars
    Just made this cake and have not frost it yet. But I noticed that it sunk a little in several places. I have not had this happen before with a cake mix. Also tHe frostiNg tastes good but its A little gritty. Any ideas why these things happened?

    1. I really wish I knew. There are reasons a cake might sink & I’m not saying you did them, but it’s hard to know…undermixing, incorrect amounts of ingredients, moving the cake while baking, etc. I’m sorry it did. If my frosting gets too gritty, I just add a little more powdered sugar.

  8. Please put the Weight of cake mix when including in recipes. Think they aRe down to 15.25 ounces now. I keep a vanilla cake mix in pantry to supplement the mix in recipes indicating the larger size boxes. Please clarify on this recipe what ounce box you are meaning.

  9. 4 stars
    So i doubled this recipe like you said for a jellyRoll pan. I had way to much batter. I was able to make a smaller cake!! Also the edges of the Cake pulled away from The pan? Not sure why this happened..

    1. Darn…I’m sorry that happened. I am not sure why they did. I haven’t had them pull away like that.

    1. Oh, no..I am so sorry it did. Not sure what happened. I know google has lots of suggestions on why that happens.

  10. 5 stars
    This cake comes out absolutely delicious. Im not a fan of super sweet frosting so I cut down the amount of confectioners sugar by half and it was fine. Moist, flavorful and delicious!!

  11. 5 stars
    I make this cake every year on my husband’s birthday since his cake request is a lemon cake. It’s super easy to make, and it tastes so much better than standard box cake mix because of the addition of the white chocolate pudding mix. For some reason, it tastes even better the day after it’s made compared to the first day. I’ve got the cake in the oven right now, and am looking forward to eating some tonight and tomorrow with my family. ❤️

  12. 5 stars
    This is the moist & fluffy cake ever! I love the refreshing hint of lemon flavor! It will be great all summer long!

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