Easy Triple Berry Crumble | with Frozen Berries!
The easiest triple berry crumble, made with frozen berries! Topped with a delicious oat crumble topping and ready in just 10 minutes!
Table of Contents
What Makes This Recipe Great
If you’re like me, you crave perfect spring berries all year long. Thanks to this frozen berry crumble dessert, I can enjoy fresh berry desserts any time! My freezer is always stocked with a huge back of frozen berries from Costco. Whether I decide to make a smoothie, this dessert, or anything else with berries, that frozen bag is my go-to!
The best part? Frozen berries aren’t just good frozen. Thaw them out, and you have yourself the perfect berries for whatever dish you plan to make!
This easy mixed frozen berries recipe comes together in just 10 minutes and features the yummiest oat crumble topping. A quick and easy dessert the whole family will love!
Watch The Recipe Video
Note: You can also watch this recipe video on YouTube.
How to Make This Recipe
Frozen fruit is best because it is frozen when it is at peak freshness. It has tons more flavor and nutrients. Plus, frozen organic fruit is much cheaper than fresh. Win win!
Since the berries are getting baked, it is perfect to use frozen berries. They’re going to get all soft and mushy anyway. Even better? You can cook it with the berries frozen! No need to thaw them. You can have this frozen berry crumble prepped and in the oven in less than 10 minutes. Love that!
Flour & Sugar: The berry filling comes together quite easily. Because the berries will sweat a bit, I like to thicken them with some added flour, along with a little granulated sugar for added sweetness. Some recipes use sugar and cornstarch, but I prefer flour!
Lemon Zest: Don’t miss this step! The lemon zest adds brightness to the berry mixture which is a must.
Frozen Berries: My favorite frozen berries to use are a combination of raspberries, blueberries, and blackberries. I love the fruit mixture, but you could use just 1 berry or any combination of other berries. For larger fruit/berries like strawberries, cherries, mango, etc I will pulse the frozen fruit in the food processor a few times so the chunks are more bite-size.
Fresh Berries: This same recipe also works for fresh fruit too! Just substitute the same amount of fresh berries for frozen. No other substitutions or changes in baking time are needed.
Oat Crumble Topping: The real star of this frozen berry crumble is the oat crumble topping. Crunchy and toasty rolled oats mixed with unsalted butter, flour, and brown sugar. It crisps up atop the berries and gives this dessert a perfect sweet oat crumble crunch. Literally, the best oat crumble topping I have ever had!
Recipe Step by Step
- In a large bowl, make the berry filling by combining all ingredients and tossing to combine. Set aside.
- In a separate mixing bowl, make the oat crumble by combining all ingredients, then use your fingers to pinch the butter and incorporate it with the dry ingredients. Keep pinching and tossing together with your hands until evenly combined. You will be left with many pea-sized pieces of butter mixed in with the oat mixture. Set aside.
- Pour the berry filling into a 1-1/2 quart baking dish (or an 8×8 pyrex baking dish, a pie baking dish, or even a 12″ cast iron skillet). Top with the oat crumble topping and spread to an even layer.
- Bake uncovered until the berry filling is bubbling, and the oat crumble top is golden brown, about 1 hour. Let cool for 1 hour before serving.
- Serve at room temperature. Delicious with ice cream or whipped cream.
How to Serve this Triple Berry Crumble: Top this frozen fruit crumble with some ice cream, and you’ve got the easiest and most amazing dessert to serve to guests or your family!
Make-Ahead: You can make this up to step 4, then cover tightly and refrigerate for up to 5 days or freeze for up to 6 months. Bake it thawed or fully frozen until golden and bubbling, about 1 hour.
Leftovers: Leftovers will keep in an airtight container refrigerated for at least 5 days. Heat up in the microwave and serve with vanilla ice cream.
Yes! Sub in whatever berry you love. This frozen berry dessert recipe would work so well with frozen strawberries, raspberries, etc. So grab your favorite frozen berry and transform this recipe into Frozen Blackberry Crumble, Frozen Blueberry Crumble, and more! The instructions stay exactly the same regardless of the berries you choose!
I have not tried to do this myself, but the substitutions for a dairy-free berry crumble would be pretty easy. Simply swap out the butter in the oat crumble topping for vegan butter (I like Miyokos!), and serve with dairy-free vegan ice cream. Let me know in the comments how this turns out!
Yes! Simply freeze leftovers in a freezer-safe, airtight container for up to 6 months. Thaw overnight in the refrigerator or go straight from frozen and bake at 350F until warmed and bubbly.
More Ways to Use Frozen Berries
Did you love this recipe? Thank you! Please rate this recipe and leave a review below. I respond to every one! Be sure to follow me on Instagram, Pinterest, TikTok, and Facebook. Tag me if you try a recipe!
Easy Triple Berry Crumble | with Frozen Berries!
- 4 cups frozen mixed berries*, NOT thawed (about 24 ounces frozen fruit)
- 3 tablespoons granulated sugar
- 3 tablespoons all purpose flour
- zest from 1 lemon
- pinch of salt
Oat Crumble Topping
- 1 cup old fashioned rolled oats
- 1/2 cup brown sugar
- 6 tablespoons all purpose flour
- 1/2 cup butter, cut into small cubes
- Preheat oven to 350 degrees with the oven in the middle position.
- In a mixing bowl, make the berry filling by combining all ingredients and tossing to combine. Set aside.
- In a separate mixing bowl, make the oat crumble by combining all ingredients, then use your fingers to pinch the butter and incorporate with the dry ingredients. Keep pinching and tossing together with your hands until evenly combined. You will be left with many pea sized pieces of butter mixed in with the oat mixture. Set aside.
- Pour the berry filing into a 1-1/2 quart baking dish (or 8×8 pyrex baking dish, a pie baking dish, or even 12" cast iron skillet). Top with the oat crumble topping, and spread to an even layer.
- Bake uncovered until the berry filling is bubbling, and the oat crumble is golden brown, about 1 hour. Let cool for 1 hour before serving. Serve room temperature. Delicious with ice cream or whipped cream.
- See the Recipe Notes below for more tips, FAQ's and ingredient substitutions.
146 Comments on “Easy Triple Berry Crumble | with Frozen Berries!”
The crumble recipe was successful, unfortunately the recipe never told me how much flour lemon and sugar to use to put over the berries. I just guessed and did not add the lemon. I will let you know if it turned out alright.
All measurements are in the recipe card at the bottom of the post. I hope that clears things up for next time!
Easy and yummy! My boyfriend ate the entire dish in one weekend! Will definitely be making this again..and again.. and again!
Love to hear this! Thank you, Nancy!
Looks good! Can I make this ahead with frozen berries, or does it get too soggy?
You can make it ahead! I’d recommend baking it ahead. It keeps at room temperature just great for a day or 2. Or, assemble earlier in the day you are intending on serving and bake then. It comes together so very fast!
like this recipe. My sister recommended it with her organic frozen berries. always nice to try healthy recipes. thankyou.
Thanks, Colleen! So happy to hear this!
I am in South-Africa where fruit is plenty. Second time making this recipe, can’t wait to eat it. Bought, chopped and froze nectarines for the next batch. I really also can’t wait to try apples… I wish I could just eat the whole dish by myself, it’s that good!
Hi Izelle! I love this! And wow, I am so honored you’re making this recipe from South Africa! Love your idea for nectarines! Can’t wait to hear how it turns out!
So easy and my sons both loved it as a dessert. They asked me to make it again- in my house that is a real endorsement!
Awww this is the best!! Thank you, Paula!
I’ve made this dessert a half a dozen times and it’s excellent. I use frozen Saskatoon berries as they were just in season where I live and it turns out so delicious. I also double the topping each time! Such a treat!
Thank you, Lyndsay! Those berries sound absolutely delicious, and doubling the topping is brilliant! So happy you’re here and honored you love this recipe!
We LOVE LOVE LOVE this recipe! I make it at least once a month – even in the summer, in the smoker! Yummm!!
Forgot to add… we use berries of every sort, and often add frozen mango and/or peaches. Oh my goodness!! ♥️♥️♥️
Aww, thank you Liz! This is the best compliment! Making this recipe in the smoker is brilliant!
Can I use cornstarch instead of flour with the fruit? How much? I read 1 tsp cornstarch to 1 cup fruit. Does that seem right?
I’ve never tried this, but I would think it would be the same ratio to swap for flour!
I have a “gluten free” granddaughter. It is generally best to use 1/2 the amount of cornstarch that you would wheat flour. BTW…I made this recipe today with Stevia and cornstarch in the berries and gluten-free flour in the topping. Plus, I 1-1/2 times the topping quantities cuz that’s our favorite part. Yum.
This is so good and easy, too. Thanks for this recipe.
I’m so glad you like it, Vela! Thank you!
Hi, wondering if I could substitute GF flour as I’m planning on making this for my hubby’s bday BBQ and a couple people try to be GF as much as possible.
Yes! GF flour will work just the same! Same quantity needed as regular flour. Hope your family loves it! So honored you’ll be making my recipe!
This is delicious! So easy and simple to make. I used fresh blueberries and frozen peaches (love the combination). Love that it’s not super sweet – just enough sweetness. It added a pinch of cinnamon to the fruit just because. This is a keeper. Going to make sure I have frozen berries on hand in the future. Definitely making again!
Hi Margaret! I LOVE this combo! And the cinnamon is a great addition! So glad you liked this recipe. It’s one of my favs too!
I’ve been making this for a couple years now and we LOVE it! I saw the comment about using it with plain yogurt so I doubled it tonight! I used frozen peaches & mixed berries! I always cut the butter 🧈 in half (high cholesterol issues) and it’s still delicious! Thank You!
Hi Lisa! I am so glad you love this recipe and feel so honored you’ve been here for a couple of years- AMAZING!
Love this recipe very easy to make , this is great for teaching a beginner how to bake a simple easy dessert , that’s delicious and also great for breakfast according to my son’s that now make this all the time .
Thank you, Lori! I am so happy you were able to share this recipe with your sons and that they love it so much too! Honored :)
I love crumbles and this has to be one of my favorite recipes ever — first place tie with the old Moosewood Navajo Peach Crumble. Adding the lemon zest to the frozen fruit is everything! I double the recipe, because the leftovers are so good with plain yogurt for breakfast.
Wow, Cathy, I’m so honored! Thank you for choosing my recipe for such a top spot in your rotation and for commenting- means the world to me!
It was awesome we all enjoyed will make again
Thank you, Lorraine! Means so much!
Do you recommend salted or unsalted butter?
I use salted butter! You can use unsalted too, just add in a pinch of salt.
I’ve done this with mixed berries many times and it’s always delicious. My husband dearly loves peaches so I decided to try those instead of the berries. Guess what—they were outstanding! We look for sales on frozen fruit so we always have at least two bags on hand so we can make this anytime.
Hi Patty! Peaches are SO perfect for this recipe! I am so happy to hear that it turned out so well and that you and your husband enjoy this recipe so much!
If I double this recipe, can I use 9/13 baking dish for it? Thanks
Yes, that’s what I would do! Should fit perfectly in a 9×13.
I made this crumble for my (very accomplished in the kitchen) future Mother in law for brunch. It was such a hit that she offered to PAY me to make her another one for her upcoming ladies’ lunch. I can’t thank you enough for this simple and amazing dessert!
Hi Shelby! Omg, what a compliment to YOU! You did such a great job! So so happy to have provided the recipe, but way to go at the execution!