Lemon Cake Mix Whoopie Pies

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Last updated on January 26th, 2026 at 11:03 pm

You will love this recipe for Lemon Cake Mix Whoopie Pies if you want something pretty and homemade without spending your whole day in the kitchen. These soft, fluffy little cake sandwiches look super fancy, taste like spring, and start with a simple box of lemon cake mix. They are perfect for spring baking ideas, Easter baking ideas, baby showers, bridal showers, or just a weeknight treat when you need something bright and happy fast.

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Ingredients for Lemon Cake Mix Whoopie Pies

Lemon cake rounds

1 box lemon cake mix (15.25 oz)
2 large eggs
1/3 cup neutral oil (canola or vegetable oil)
1/4 cup sour cream or Greek yogurt (keeps them soft and fluffy)
1/4 cup water or milk
1 tablespoon lemon zest (optional, but gives a “real lemon” bakery flavor)
2 tablespoons cornstarch or flour (helps your whoopie pie rounds keep their shape)
Optional; 1/2 teaspoon vanilla extract

Vanilla filling

1/2 cup (1 stick) unsalted butter, softened
1 1/2 to 2 cups powdered sugar
1 teaspoon vanilla extract
Pinch of salt
2-3 tablespoons heavy cream or milk (to adjust texture)

Optional twist- For lemon vanilla filling, add:

Extra lemon zest
A few drops of fresh lemon juice, to taste

How to Make Lemon Cake Mix Whoopie Pies

1. Heat the oven to 350°F. Line baking sheets with parchment paper so the cakes release easily and keep their pretty shape.

2. Zest a lemon

3. In a large mixing bowl, add lemon cake mix, eggs, neutral oil, sour cream or Greek yogurt, milk, Lemon zest and vanilla extract. Stir until everything is combined and smooth. The batter should be thick and scoopable, more like cookie dough than runny cake batter.

Avoid overmixing; once there are no dry spots, you’re good.

4. Use a 1 1/2 tablespoon cookie scoop or a heaping tablespoon to scoop mounds of batter onto the prepared baking sheets.

Space them about 2 inches apart, because they will spread into cute little cake rounds while they bake.

5. Bake for 8 to 10 minutes, until the tops spring back when lightly touched and the edges look set.

Do not wait for browning, you want them soft and pale for that classic whoopie pie look. If they’re starting to brown, take them out of the oven immediately.

6. Let the cakes cool on the baking sheet. When they’re completely cool and you’re ready to add the filling, carefully lift the whoopie pie rounds off the baking sheet. You may need a rubber spatula to gently pull them up.

lemon cake mix whoopie pie batter scooped on a baking sheet

lemon whoopie pie rounds matched up and vanilla filling in a piping bag

7. In a medium bowl, beat the softened butter with a hand mixer or stand mixer for about 1 minute until creamy. Add your powdered sugar a cup at a time, plus vanilla extract. Beat until light and fluffy.

8. Add 1 tablespoon heavy cream or milk and mix again. If the filling is too thick, add another splash of cream or milk. If it is too thin, beat in more powdered sugar a little at a time. You want a thick, pipeable filling that will hold its shape between the cake rounds.

For a lemon vanilla twist, beat in lemon zest, then add lemon juice a few drops at a time until you like the flavor.

9. Pair up your cooled lemon cake rounds by size so each sandwich looks neat and even.

10. Transfer the filling to a piping bag with a star tip (I like the Wilton 1M tip) or zip-top bag with the corner snipped off. You can also just use a spoon or offset spatula.

vanilla filling spread one lemon whoopie pie rounds

11. Pipe or spread a generous layer of filling onto the flat side of one cake. Then, top with the flat side of a second cake and gently press to spread the filling to the edges.

Repeat with the remaining cakes and filling.

10. Place the assembled whoopie pies in a single layer in an airtight container that’s lined with parchment paper or sprinkled with a bit of powdered sugar. Refrigerate for 3 to 4 days; let them come to room temperature before serving so the cakes are soft and the filling is creamy.

To freeze, layer whoopie pies between sheets of parchment in a freezer-safe container and freeze for up to 1 month. Thaw in the fridge overnight.

These lemon whoopie pies are just lovely on a dessert tray with other cake mix desserts for holidays or brunches.

Pro Tips

Do not overbake. That is the number one reason whoopie pies turn out dry. Pull them as soon as the tops spring back and the edges look set.
Sour cream or Greek yogurt mixed in with the cake mix really helps with the softness. Don’t skip that if at all possible.
The batter should be thick. If it is runny, the cakes will spread too flat. Chill the batter for 10 minutes if needed to firm it up.
Use a piping bag for pretty filling. I like to use the Wilton 1M star tip, but you can also use a plain round tip. I like to start in the middle of my whoopie pie round and then pipe a swirl working my way out to the edges.
Beware that whoopie pies like to stick to things. They’re wonderful, soft cake-iness will indeed stick to any smooth surface. I recommend lining your storage container with parchment paper and sometimes even a little dusting of powdered sugar can help.

FAQs

Can I use a different flavor cake mix?

For sure! This method works with almost any cake mix. Strawberry, funfetti, or vanilla cake mix whoopie pies are all adorable. Lemon is perfect for spring, but feel free to play. Just check the weight on your cake mix to make sure you have the right wet to dry ratio. I use the Duncan Hines cake mixes because they’re always 15.25 oz. Other cake mixes are smaller, which means that you might have too much liquid in the end and your cakes could come out a bit runny.

Do I have to use sour cream or Greek yogurt?

I highly recommend it, but you technically don’t have to. That little bit of sour cream or Greek yogurt is what keeps the cake rounds soft and moist. If you leave it out, the texture may be drier and more cookie-like.

My batter seems too thin. What should I do?

Let the batter sit for 5 to 10 minutes or pop it in the fridge briefly. It will thicken slightly. You can also add 1 to 2 tablespoons of all-purpose flour if needed. The batter should hold its shape on the baking sheet and not really run or spread too much.

How can I make these extra lemony?

Use lemon zest in the batter plus zest and a few drops of lemon juice in the filling. You can also add a tiny drop of lemon extract to the filling if you like strong lemon flavor, but it’s very easy to overdo the lemon extract, so be cautious.

What band cake mix should I use?

I like to use Duncan Hines cake mixes, because they typically deliver the best flavor in my opinion. However, especially for this recipe, you want a cake mix that’s 15.25 ounces, which the Duncan Hines ones usually are. If you go with a different brand, just make sure you check the weight.

Are whoopie pies better cold or at room temperature?

I like to store them in the fridge for freshness, then let them sit at room temperature for about 20 minutes before serving. The cakes soften and the filling gets silky again.

Lemon Cake Mix Whoopie Pies are one of my favorite shortcuts when I want something bright, pretty, and impressive without getting stuck in the kitchen all day. They start with a simple box of cake mix, but the little upgrades like sour cream, lemon zest, and homemade vanilla filling mean that no one will know you started with a box mix.

Whether you are planning spring baking ideas for a brunch, cute Easter baking ideas for the family, or just need a sunny treat to brighten a busy week, these soft, lemony cake sandwiches fit right in. They are easy to make ahead, easy to transport, and always the first thing to disappear from the dessert table.