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Mixed Berry Cake

This delicious mixed berry cake is a super easy way to level up the classic boxed cake! Just a few extra steps will take this cake from its original tastiness to its next evolution. There are so many different things you can do with boxed cake to take them to the next level and this is definitely one of them. Your loved ones won’t even know it came from a box! 

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mixed berry cake

What is mixed berry cake?

Mixed berry cake is a berry focused boxed cake that tastes amazing! We’re using frozen mixed berries to add flavour to different parts of the cake. The berry puree gets added to the pre-made frosting to create a vanilla berry combination. It’s also added in between the cake layers to infuse some of that flavour into the cake itself. The berries also get roughly chopped up and put in between the two cake layers. You can also put them on top if you desire. This cake is a two layer round cake but you can adjust it to whatever pan type you have available or prefer. It’s perfect for any function and especially when you want something a little easier! 

Ingredients

  • white boxed cake mix
  • eggs 
  • vegetable oil 
  • water
  • vanilla frosting 
  • frozen mixed berries 

How to make mixed berry cake

Prepare your cakes

To make a mixed berry cake, start by preparing your pans. Take the pan(s) of your choice, we’re using two 8” round pans, and grease and line them. Set your oven to the recommended temperature listed on your box cake of choice. Prepare the cake mix according to the box and evenly distribute it into your pan(s). Bake also according to the box’s instructions until you can stick a toothpick in and it comes out completely clean or with a few crumbs. Allow your cake(s) to cool completely. 

a close up of one slice of mixed berry cake

Make the puree

While the cake is cooling you can move onto making the berry puree for the frosting. All this really is is just cooked down berries so we can infuse the berry flavour into the frosting. Add the 1 ½ cups of frozen mixed berries and 2 tbsp of water to a small pot. Cook them over low heat, stirring intermittently, until the berries begin to break down. Once they’ve become soft, you can start to gently mash them with a potato masher or fork. When they’ve completely broken down as much as they can, around 10-15 minutes, turn off the heat and use an immersion blender to make the mixture as smooth as possible. Put the puree in a heat safe bowl and allow it to cool completely. You can put it in the refrigerator here if you’d like. 

Assembly

Prepare the layers of the mixed berry cake by gently removing them from their pans and leveling off the tops as evenly as possible. I don’t have anything fancy for this so I just use a serrated knife and do my best to make them flat and even. Next, remove your frosting from it’s container (you can absolutely make your own here) and mix it with ½ to ¾ of the mixed berry puree. You can use as much or as little as you want here, just be sure to keep a little leftover for the center of the two cakes.

Then, add the rest of the puree to the top of one layer of cake, spread it out evenly. Add a layer of your mixed frosting on top of that and spread evenly as well. Roughly chop the berries that have thawed and add those on top of the frosting layer. 

Then you can add your second layer of cake on top of the first and add the rest of the frosting all over the cake. This doesn’t have to be perfect, you just want to aim for an even layer of frosting all over the cake. If you’d like, you can take any extra berries you have and add them to the top of your mixed berry cake for a garnish. And now you’re ready to enjoy your cake whenever you desire! 

How to store  

You can store your mixed berry cake in an airtight container in the refrigerator for 5-7 days. If you’d like to keep it longer than that you can definitely freeze it. Just store it in a freezer safe container and you can keep it frozen well for up to 3 months. I highly recommend cutting it into slices before freezing it so that when you want a piece you can just go in and take out as many as you know you’ll eat. Allow the cake to come to room temperature and enjoy it whenever you’d like! 

the final cake on a stand showing the inside
mixed berry cake
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5 from 1 vote

Mixed Berry Cake

This delicious mixed berry cake is a super easy way to level up the classic boxed cake! Just a few extra steps will take this cake from its original tastiness to its next evolution. There are so many different things you can do with boxed cake to take them to the next level and this is definitely one of them. Your loved ones won’t even know it came from a box! 
Prep Time20 minutes
Cook Time25 minutes
Total Time45 minutes
Course: Dessert
Cuisine: American
Keyword: berry, berry cake, boxed cake, cake, cake mix, mixed berry, mixed berry cake
Servings: 8 pieces
Author: Gianna

Ingredients

  • 1 white boxed cake mix
  • eggs
  • oil
  • 1 store bought vanilla frosting
  • 1 ½ cups frozen mixed berries
  • 1 cup thawed mixed berries
  • extra berries for garnish

Instructions

  • Prepare your boxed cake according to the instructions and bake in 2 8” or 9” pans. When done, allow to cool completely.
  • Make the mixed berry puree by adding 1 ½ cups of frozen mixed berries with 2 tbsp of water to a small pot.
  • Cook over low heat until the berries begin to break down. Stir periodically. Gently mash the berries with a potato masher or fork.
  • When the berries have been completely cooked and broken down, use an immersion blender to make the mixture smooth.
  • Remove mixture from the heat and let cool completely.
  • Level both cakes by shaving the top pieces off as evenly as possible.
  • Mix ½-¾ of the berry puree with the entire package of vanilla frosting.
  • Add the rest of the berry puree or as much as desired to the top of the first layer of cake. Add a layer of frosting on top of that.
  • Roughly chop the thawed berries and all them on top of the frosting.
  • Add the second layer of cake on top and add frosting all over the entire cake.
  • Garnish with extra berries if desired and enjoy!

Try these recipes next:

Strawberry Shortcake Blondies

Dulce de Leche Brownies

Dunkaroo Cookie Bars

Brown Butter Rice Krispie Treats

Nutella Chocolate Chip Cookies

3 Comments

  1. This looks delicious!!

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