Easy Chocolate Whoopie Pies with Peanut Butter Marshmallow Filling

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 Whip up soft chocolate whoopie pies with the help of a cake mix, then fill them with a tasty peanut butter marshmallow filling for an extra memorable treat!

Homemade whoopie pies are the perfect mix of cookie, cake and frosting. This recipe uses the shortcut of a cake mix, so they are super simple to make.

The filling has bold peanut butter flavor with the marshmallow undertones you would expect in a classic whoopie pie. The end result is a fun hand held treat that is sure to wow.

Have you ever had a whoopie pie? The soft cake-like cookies sandwich a creamy marshmallow filling for a tasty dessert sandwich. 

They are the official state treat of Maine and a Pennsylvania Amish tradition. For good reason too, they are super delicious. 

Each bite is like a mash up of some of our favorite desserts. They are part cake, part cookie and of course that sweet filling draws you in.

Luckily with the help of a cake mix, you can whip up a batch with almost no effort at all. Plus that make changing out the flavor profile super simple. 

I will highlight some tasty whoopie pie flavor ideas below to get your creative juices flowing. If you try some, let me know how it goes.

But if you are a chocolate and peanut butter fan, you have to start with this recipe as written. They are super delicious and the hefty amount of peanut butter helps keep these whoopie pies from tasting too sweet.

Tips for baking your whoopie pies

Because you start with a cake mix, the batter comes together really quickly. Just make sure your butter is softened so everything incorporates nicely.

The batter should be like a thick cake batter or slightly loose cookie dough. It’s a little bit sticky but should be able to mostly hold its shape.

Using a cookie scoop is a great way to evenly portion the dough while also giving them a nice round shape. I used a medium cookie scoop for these and the resulting whoopie pies were relatively large.

You can use a small cookie scoop to get twice as many smaller treats. Which is better will totally depend on how you plan to serve them.

To get the best thick, soft, cake like cookie you will want to refrigerate the scoops of dough for about a half hour. That will give you nice rounded domes and cakey interiors.

Let them cool completely and add your filling. It really is that easy!

The Peanut Butter Fluffernutter Filling

Whoopie pies traditionally have a marshmallow-y filling, so I wanted to keep the tradition alive in these. But of course I wanted to do something a little different as well.

Adding peanut butter was a perfect solution! The peanut butter brings that little bit of salty savory and pairs wonderfully with the chocolate. 

If peanut butter isn’t your jam, marshmallow fluff buttercream would be a fabulous option. Or use a simple vanilla American buttercream. 

Once the cookies have cooled, you can spread, pipe or scoop the filling on on and top it with another. Frosting fanatics, feel free to be generous with that filling! 

More Easy Whoopie Pie Flavor Combination Ideas 

You can easily use this base recipe and switch out the cake mix you use to make an endless variety of whoopie pie flavor combinations. In fact, it would be fun to do a display of different types as a fun dessert spread at a party.

If you decide to do more than one flavor, just be sure to make the smaller versions. People are definitely going to want to try more than one!

Lemon lovers can use a lemon cake mix to make fun citrusy whoopie pies. Some lemon sweetened condensed milk buttercream would be a fabulous filling. Or make lemon blueberry whoopie pies for an extra summery treat!

Use funfetti cake mix and fluffy sweetened condensed milk buttercream for birthday whoopie pies.

Or use a butter recipe vanilla cake mix and chocolate sweetened condensed milk buttercream for an inside out whoopie pie. 

A red velvet, carrot cake or spice cake mix would pair wonderfully with decorator’s cream cheese frosting.

See the possibilities really are endless! 

More Cookie Recipes

Maple cinnamon cookies are kissed with the warmth of maple and brown sugar and a hint of cinnamon. They are big and chewy and oh so good!

Super soft sugar cookie bars topped with a fluffy layer buttercream are a fun and easy treat. They are so much quicker to make than individual cookies and taste great!

Make simple chocolate spritz cookies extraordinary by sandwiching a layer of rich ganache style frosting between them.

Chewy brown sugary blondies loaded with chocolate chunks, caramel undertones and topped with M&Ms. This big batch of bars is perfect for a party, carry-in or just because.

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