A warm keto raspberry crumble with chunky fruit filling and a buttery triple-nut topping, 4.6g net carbs per serving. It's what I bake when I want a fruity dessert with real texture, and the crumble stays crispy from first bite to leftovers.
I started making this raspberry crumble about five years ago, and it went through a lot of versions before I landed here. The early ones had soggy toppings, watery fillings, or just tasted like almond flour and sadness. This version holds up.
The topping is what makes it. I use a combination of almond flour, walnuts, pecans, and hemp hearts, which gives you layers of crunch that a single-nut topping can't match. The hemp hearts add this subtle nutty chew that rounds everything out. I pulse it all in the food processor with cold butter until it looks like coarse sand with pebbles, and that uneven texture is exactly what you want. The bigger pieces toast up golden, the smaller bits get crispy, and none of it turns to mush.
For the filling, fresh raspberries break down into this thick, jammy sauce in the oven. I use xanthan gum as the thickener (arrowroot is listed as an option, but xanthan gum has held up better for me, more on that in the how-to below) and just enough sweetener to balance the tartness without burying the fruit flavor. The raspberries do most of the work on their own.
I serve this warm with a scoop of keto vanilla ice cream or a pile of whipped cream. It's also good alongside keto strawberry ice cream if you want to double down on the berry situation. Reheated the next day, it's still solid. The topping crisps back up in a 300-degree oven for about 10 minutes.
One reader, Ashley, told me she tried six different low carb crumble recipes before landing on this one. Her words: "The topping actually stays crumbly instead of turning into a sad mush, and the raspberries don't get watery." That's the whole point of this recipe. The filling stays thick, the topping stays crunchy, and it tastes like the real thing.
If you like fruity keto desserts, I also make a keto chocolate trifle that layers well with berries, and my almond flour cookies use a similar base if you want something more portable. But when I want something warm out of the oven with that fruit-and-crumble smell filling the kitchen, this is what I reach for.
Here it is straight from the baking dish, golden brown on top with the raspberry layer underneath.
I pulse the topping in a food processor, but a blender works too if you don’t have one.
A scoop of low carb vanilla ice cream on top is how I serve it most often.
How to Make Keto Raspberry Crumble
The two things that make or break any fruit crumble are the thickener and the topping texture. I've tested both sides of this recipe more times than I should probably admit.
Thickener: xanthan gum has given me the best results. I tried arrowroot early on and it thickened fine in the oven, but as soon as the crumble cooled to room temperature, the filling thinned right back out. Xanthan gum holds at every temperature. One teaspoon is all it takes. A reader named Lynn confirmed the same arrowroot issue in her version, so this isn't just my kitchen.
Topping texture: cold butter and a quick pulse. Cut your butter into small cubes straight from the fridge. Pulse in the food processor just until you see coarse crumbles with some bigger chunks still visible. If you over-process it into a fine powder, you lose the crunchy pieces that make this topping work. Think gravel, not sand. I use a similar cold-butter technique for my keto pie crust, and it works the same way there.
Freezing and make-ahead. I assemble the whole thing unbaked, cover tightly with foil, and freeze for up to a month. Bake from frozen at 350 degrees, adding 8-10 extra minutes. The topping still crisps up. You can also freeze baked leftovers and reheat in a 300-degree oven for about 10 minutes.
For a summer version, try mixing in fresh strawberries alongside the raspberries. I've done a half-and-half split that worked well, and it pairs nicely with keto strawberry shortcake kebabs or a scoop of strawberry sorbet for a full berry spread.
In a medium bowl, combine the raspberries, xanthan gum or arrowroot powder, 1/3 cup sugar-free sweetener and vanilla. Set aside.
3
Make the crumble topping
Using a food processor, add almond flour, 1/4 cup sugar-free sweetener, golden monkfruit, walnuts, pecans, hemp hearts, salt and butter. Pulse until mixture looks like coarse crumbles.
4
Spread it
Spread the berry mixture inside a square baking dish.
5
Add the topping
Add crumble topping on top and spread evenly. Bake at 350 degrees for 20 to 25 minutes or until the top is golden brown. Let cool. Top with whipped cream or serve with keto ice cream.
Nutrition
Per serving: 1/9 of recipe
Calories
321
Fat
30.4g
Protein
6.3g
Total carbs
10.3g
Net carbs
4.6g
Nutrition is an estimate calculated from the ingredients listed. Brands vary, so check labels if you track closely.
Frequently Asked Questions
Are raspberries keto-friendly in this crumble?
Yes. Raspberries are one of the lowest-sugar fruits I use in baking, which is why they work here where most fruit would not. They are still the main carb source in this recipe, but three cups spread across nine squares keeps each square at the 4.6g net carbs the card lists. The sugar-free sweetener adds zero net carbs, so the berries are the only number you are really managing.
Can I make keto raspberry crumble ahead of time?
Yes. A day or two ahead, I prep the topping and the berry filling separately, keep both in the fridge for up to two days, then assemble and bake. The topping actually gets crunchier after a night in the fridge because the butter firms up even more. I do not assemble it unbaked and refrigerate overnight, because the berries release juice and the topping soaks it up. For freezing, follow the freezer directions in the how-to above; the one extra step I take with baked leftovers is wrapping individual portions so I can reheat a single square at a time.
Can I use mixed berries instead of all raspberries?
I've made this with a half-and-half mix of raspberries and strawberries and it worked well. Blueberries and blackberries also work, but I find they release more liquid during baking, so I add an extra quarter teaspoon of xanthan gum when I use those. The bake time stays the same either way.
What can I substitute for almond flour in this recipe?
I've tested sunflower seed flour and it works as a direct 1:1 swap. The topping has a slightly different flavor but still crisps up the same way. Coconut flour absorbs a lot more liquid, so when I use that, I cut the amount to about a third and add an extra tablespoon of butter to keep the crumble texture right.
Can I make this dairy-free?
I've made it with coconut oil instead of butter and it works. The topping is a little less golden and the flavor leans more neutral, but the crunch is still there. My preference is still butter for the richness it adds, but coconut oil is a solid swap if dairy is off the table for you.
What sweetener works best for this recipe?
I use a monk fruit and erythritol blend for both the filling and the topping, plus the 1/4 cup golden monk fruit that goes into the topping. My family prefers the monk fruit blend because it browns better in the topping. If sugar alcohols bother your stomach, pure stevia works, but you have to add it to taste. Stevia does not measure cup for cup with sugar, so start with less than the recipe calls for and adjust until the filling tastes right.
Mine browned on top well before the middle set, so I tented it with foil and gave it another 8 minutes. Flavor is great, the 20 to 25 minute range just ran short for me. Thanks!
Annie, the smell when this comes out of the oven is a little ridiculous honestly, toasted walnuts and warm raspberry all at once, I was basically sold before I even got it to the table. One note: the filling sweetener felt a touch high for me the first time, not dramatically, but the berries felt a little muted. Pulled it back to about a quarter cup and that tart bite came through the way it should. Crumble is perfect as written.
I forgot to cover it for the drive and somehow the nut crumble survived a 20-minute car ride intact. Brought it to a cookout on Saturday and two people asked if I’d bought it.
First keto crumble and the raspberry part surprised me more than the topping. Chunky, tart, not the syrupy gel I’ve gotten from other keto fruit desserts. Obsessed.
Bringing this to a potluck Saturday and baking Thursday so I’m not scrambling that morning. Will the crumble topping still be crispy, or does it soften up after a day or two?
Wendy, five batches. I think you’ve figured out the exact minute to pull it, and that’s the whole game with the crunch. I always push it a little past where it looks done.
My daughter has strong opinions about fruit desserts (translation: she does not like them). I made this on a Sunday without announcing what it was, and she walked into the kitchen asking what was in the oven before it even came out. The walnut and pecan crumble gets this toasty, buttery smell around the 20-minute mark that apparently overrode her standing hatred of raspberries. It’s going in the regular rotation.
My husband went back to scrape the baking dish for just the leftover crumble, no fruit, which is how I knew the nut topping was the real star here. Making double the crumble next time and using half the raspberries.
Thought xanthan gum would do that gel thing it always does in keto fruit desserts. Nope. Thick and chunky filling, and now every crumble I’ve made before this feels like a rough draft.
That’s the xanthan gum doing its actual job. Holds the fruit together without turning it into a jelly. Arrowroot is what causes the gel-then-watery thing once it cools.
My husband is impossible about dessert. Genuinely nitpicky about texture. He ate half the baking dish before I got a second serving. What made me laugh was he stopped mid-bite and asked what I’d put in the topping that made it crunch like that. He has never once asked me about an ingredient in 12 years of marriage. It’s the walnut-pecan combination, for the record, and apparently it’s the thing that got him.
12 years and the walnut-pecan crumble got him talking. Those two toast at slightly different rates so you get layered crunch instead of just one note. Half the dish is about right.
Tripling this for my wife’s book club Saturday (12 women to impress) and I don’t want to wreck the crumble. Does the almond flour to nuts ratio scale straight across, or does the topping need tweaking? And I’m guessing the 20-25 minute bake time shifts when the pan is a lot fuller?
Ratio scales straight across, no tweaking needed. The almond flour to nut split is what gives it that chunky crumble texture and it holds up when you triple.
For timing it depends on your pan setup. Three separate pans, same 20-25 minutes. One big deep dish with everything in it, start checking at 25 and give it to 30-35. The raspberry filling is the slow part when there’s more depth.
Skeptical about the hemp hearts in a dessert crumble, but they add a subtle nuttiness that actually belongs there. Held its texture the next day, which I wasn’t expecting.
They were the wild card when I was testing this. Almost cut them. But that subtle nuttiness they add is what separates this from a basic almond flour crumble.
I grew up eating fruit crumbles at my grandma’s, every holiday and summer visit, and when I started keto last October I thought that chapter was just closed. Then I found this and I was nervous. I’m not a baker and xanthan gum sounds like something from a chemistry class. Made it on a snowy Saturday afternoon not expecting much. Opened the oven and the whole kitchen smelled like her kitchen used to smell and I just kind of stood there. The raspberries go all thick and jammy under that buttery crumble topping, the nuts give it this crunch I didn’t see coming. Ate mine warm with a little whipped cream and I teared up, which I know is a weird thing to say about dessert, but if you’ve been doing keto long enough you’ll understand. Thank you for this one.
Do you experience any GI distress from all the sugar alcohols? I’m usually very sensitive and try to stay away, but could I substitute pure stevia for the sweeteners and be ok?
