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Lemon Blueberry Whoopie Pies with a Cake Mix

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Soft lemon whoopie pies filled with bright blueberry buttercream are easy to make with the help of a cake mix. They are a perfect handheld treat for spring and summer.

Hand holding lemon whoopie pie with rounded cakelike cookies sandwiched around blueberry filling.

There is just something about the combination of bright citrusy lemon and berries. Putting them together in the form of whoopie pies means you get the best part of cookies and cake in a fun little package.

They are sweet, tart and perfectly portable. So they are wonderful for parties, picnics, bbqs and more.

Not only is the flavor bright and cheery, the colors are too. These fun whoopie pies are sure to pyr a smile on your face.

Making the whoopie pies

The soft cakey cookies that make the outside of the sandwich only take a few ingredients. Starting with a lemon cake mix makes them super simple.

A stick of softened butter, eggs and a little bit of sour cream is all you need. In fact the sour cream is the only ingredient you have to measure, the rest is just counting.

lemon whoopie pie batter in mixing bowl with beaters.

The key to getting fluffy rounded pillowy whoopie pies is to chill the scoops of batter before you bake them. That will help the cookies stay proud and round rather than spreading and flattening.

Use a cookie scoop to get the sticky batter most of the way shaped. After a half hour in the refrigerator, gently press down any ridges or pointy bits of batter.

The next key is to bake them enough that they are finished but not too mich. You want the final texture to be soft and cakey.

Scoops of lemon whoopie pie batter on pan ready to bake.

So try not to let them get too much color. If you hit it just right, they are a thing of glory.

After a couple of minutes to set up on the pan, go ahead and remove them to a wire rack.

Once they are cooled completely, they are ready to be filled. Now the fun can really begin!

Filling your whoopie pies

These fun whoopie pies are filled with blueberry buttercream. It’s a traditional American style buttercream that is flavored with freeze dried blueberries and a splash of lemon juice.

Of course they would also be delicious with marshmallow fluff buttercream or marshmallow buttercream made with actual marshmallows if you want to stick to the more traditional marshmallow filling.

swirl of blueberry buttercream piped on top of lemon whoopie pie.

Or use lemon sweetened condensed milk buttercream if you want to go full lemon. Or use strawberry buttercream for a strawberry lemonade inspired treat.

You could just scoop on a bit of frosting or smear some on with a knife. I like to use a piping bag and a star shaped tip because it is just as fast for me and a little more fun.

hand holding lemon whoopie pie with blueberry buttercream filling with a bite missing.

Little Dude actually piped the centers on these while I took pictures for the video. He is really turning into a fabulous helper!

More fun handheld treats

If you want a deeper flavored whoopie pie, try out chocolate whoopie pies with peanut butter marshmallow filling. They feature that popular mix of flavors in a fun soft dessert.

Oatmeal cream pie bars are another fun twist on a classic. They have a molasses-y oatmeal cookie bar base with marshmallow fluff frosting that come together to taste a lot like packaged oatmeal creme pies.

Yellow lemon whoopie pies with deep purple blueberry frosting piped between the layers.

Or whip up some soft sugar cookie bars. We like ours with a healthy dose of buttercream on top and they remind us of Lofthouse cookies.

Or make Maw-maw’s toffee bars. They are a brown sugar and butter based cookie bar topped with a layer of chocolate.

Whew! Now I want one of each. I love how easy all of these are to serve and eat at a gathering.

Love tasty recipes? I do too! Follow me on Pinterest for more delicious ideas!

Yield: 20 Whoopie Pies

Lemon Blueberry Whoopie Pies with a Cake Mix

Yellow lemon whoopie pies with deep purple blueberry frosting piped between the layers.

Soft lemon whoopie pies filled with bright blueberry buttercream are easy to make with the help of a cake mix. They are a perfect handheld treat for spring and summer.

Prep Time 15 minutes
Cook Time 30 minutes
Additional Time 30 minutes
Total Time 1 hour 15 minutes

Ingredients

Whoopie Pies

  • 1/2 cup butter, softened
  • 15.25 oz lemon cake mix
  • 3 eggs
  • 1/4 cup sour cream

Blueberry Filling

  • 3/4 cup butter, softened
  • 4 cups powdered sugar
  • 1/4 teaspoon salt
  • 1 teaspoon vanilla
  • 2 Tablespoons lemon juice
  • 1 cup freeze dried blueberries

Instructions

  1. Preheat oven to 350°F and line 3 baking sheets with silicone mats or parchment paper.
  2. In medium mixing bowl, beat butter until smooth and creamy.
  3. Add cake mix, eggs and sour cream, stir until combined.
  4. Scoop a Tablespoon (or small cookie scoop) full of batter onto the lined baking sheets, leaving plenty of room between mounds of batter.
  5. Refrigerate for at least 30 minutes.
  6. Bake for 9-10 minutes or until completely set.
  7. Cool on the baking sheet for 2 minutes then remove to a wire rack to cool completely.
  8. To make the frosting, beat the softened butter until smooth. Slowly mix in powdered sugar, salt, vanilla and lemon juice until combined.
  9. Turn blueberries into powder using either a food processor or blender. Add blueberry powder to frosting mixture.
  10. Adjust consistency with a little more milk or lemon juice if needed.
  11. Pipe or spread over 1/2 of the whoopie pies, then top with remaining whoopie pies.

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Nutrition Information:

Yield:

20

Serving Size:

1

Amount Per Serving: Calories: 290Total Fat: 14gSaturated Fat: 8gTrans Fat: 1gUnsaturated Fat: 4gCholesterol: 60mgSodium: 287mgCarbohydrates: 41gFiber: 0gSugar: 32gProtein: 2g

All nutritional information is estimated and will depend on the exact ingredients you use.

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Soft lemon whoopie pies filled with bright blueberry buttercream are easy to make with the help of a cake mix. They are a perfect handheld treat for spring and summer.

Share with your friends!

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