Baked Plum Muesli Crumble with Blackberry Sorbet
This baked plum crisp with blackberry sorbet is a warm-and-cold dessert that leans on ripe fruit for all its sweetness, so there is no added sugar needed. Juicy plums and blackberries bake under a thin, crunchy muesli topping, then get a scoop of bright, two-ingredient blackberry sorbet on the side. It is vegan, lighter than a classic butter-and-sugar crumble, and comes together with pantry-friendly ingredients.
I combined sweet and juicy plums with frozen blackberries and got a fantastic dessert. The contrast is what makes it work: the crunchy muesli crumble against the soft, jammy baked fruit, and then the icy sorbet melting into the warm spoonful. It feels indulgent without relying on processed ingredients or excess butter.
The ingredients that make it work
The filling is mostly fruit, so the quality of the produce matters more than anything. Choose plums that yield slightly to gentle pressure — fully ripe plums bake down into a soft, jammy base and carry their own sweetness, which is what lets you skip the sugar. Slice them after pitting so they cook evenly in the 20 to 25 minutes of baking time.
Blackberries do double duty here. Inside the crumble they add tartness and color; for the sorbet they are the whole show. Frozen blackberries work beautifully in both — they hold up in the oven and, for the sorbet, they are already cold enough to blend straight into a creamy scoop. The muesli on top is your crunch, so reach for a plain muesli rather than a heavily sweetened or chocolate-studded one. The whole wheat flour is the quiet workhorse: just a tablespoon and a half tossed with the fruit thickens the juices as they bake so the filling sets instead of running.
For sweetness, use whatever healthy sweetener you like, to taste. I used stevia extract, which keeps it sugar-free, but the recipe is forgiving: maple syrup, brown sugar, or another sweetener all work depending on how sweet your fruit already is. Taste the fruit first and you may need very little.
How to get the crumble right
The most common mistake with a muesli topping is overdoing it. Sprinkle just enough muesli to cover the fruit in a thin layer — pile it on too thick and the underneath stays soft and damp instead of toasting into that crisp top you want. A light, even scatter lets the oven crisp every flake.
Spread the fruit mixture evenly in the glass baking dish so it cooks at the same rate, and keep the oven at a gentle 300°F. This is a low, slow bake by design: it gives the plums time to soften and release their juices while the flour thickens them, without scorching the muesli on top. You will know it is done when the fruit is bubbling at the edges and the topping is golden and fragrant. Let it sit a few minutes before serving so the filling settles.
Making the two-ingredient blackberry sorbet
The sorbet is almost too easy: frozen blackberries, a squeeze of lime or lemon juice, and sweetener to taste, blended until creamy and served right away. The trick is keeping the berries frozen solid before they hit the blender — that frozen base is what gives you a thick, scoopable texture without an ice cream machine. The citrus juice is not optional flavor decoration; the acidity brightens the berries and keeps the color vivid.
Blend in short bursts and scrape down the sides as needed. If your blender struggles, add the lime juice first to help it catch, but resist adding extra liquid or it will turn to slush instead of sorbet. Serve it the moment it reaches a creamy consistency, because it softens fast once it leaves the blender.
Make it your own
This recipe gives you plenty of room to adapt. A few easy swaps:
- Swap the muesli for a gluten-free version to make the whole dessert gluten-free — see my gluten-free muesli recipe for a homemade base.
- Trade the whole wheat flour for oat flour or another flour you prefer; you just need a little to thicken the juices.
- Use fresh blackberries in the filling when they are in season, and keep the frozen ones for the sorbet.
- Adjust the sweetener to your fruit — very ripe plums may need almost none.
Serving, storing, and more fruit desserts to try
Serve the crisp warm from the oven with two scoops of the blackberry sorbet alongside, so the cold melts into the warm fruit. Leftover baked crumble keeps in an airtight container in the fridge for two to three days; warm it gently in the oven to bring back some of the crunch, since the topping softens once stored. The sorbet is best made and eaten fresh — if you freeze leftovers it will set hard, so let it sit at room temperature for a few minutes and give it a quick re-blend before serving.
If you love oat- and fruit-based desserts, try my easy apple crisp, baked oatmeal, or oatmeal cookies. For more crumble-style treats, take a look at my peach crumble pie and apple streusel cake. And if it is the sorbet you are after, my raspberry sorbet uses the same no-churn trick.
If you bake this plum crisp, I would love to know how it turned out — did you go for the stevia version or sweeten it another way? Leave a star rating and a comment below with your tweaks so other readers can see how you made it yours.
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Plum and Blackberry Muesli Crumble with Blackberry Sorbet
Ingredients
Muesli Crumble
- 8 plums pitted and sliced
- 3 cups blackberries fresh or frozen
- ¾ cup muesli preferably plain
- 1 ½ tbsp whole wheat flour
- healthy sweetener of your choice to taste (I used stevia extract)
Backberry Sorbet
- 2 cups blackberries frozen
- 1 lime or lemon, juiced
- healthy sweetener to taste
Instructions
- Heat the oven to 300°F (150°C).
- In a large bowl, add the sliced plums, blackberries, flour and sweetener (you can use stevia, maple syrup, brown sugar, etc.) and mix well.
- Pour the mixture into a glass baking dish and spread it out evenly.
- Sprinkle the muesli on top until the fruit is covered. Be careful not to use too much muesli; use just enough to cover the fruit with a thin layer.
- Place in the oven for 20-25 minutes.
- Serve with 2 scoops of blackberry sorbet!
Blackberry Sorbet
- Add all the sorbet ingredients to a blender and process until they reach a creamy consistency. Serve immediately.
Notes
Frequently Asked Questions
Yes. Every ingredient is plant-based: plums, blackberries, muesli, whole wheat flour, citrus juice, and a healthy sweetener. The recipe uses stevia extract to keep it both vegan and sugar-free. If you choose to sweeten with honey, it would no longer be vegan, so stick with maple syrup, stevia, or another plant-based sweetener.
Yes, that is the whole idea. Ripe plums and blackberries bring their own sweetness, so you can skip refined sugar entirely. The original uses stevia extract to taste; with very ripe fruit you may need barely any sweetener at all. Taste the fruit first and adjust from there.
For the baked crumble, fresh blackberries work just as well as frozen. For the sorbet, you specifically want frozen blackberries — the frozen base is what gives you a thick, creamy, scoopable texture without an ice cream machine. If you only have fresh berries, freeze them solid before blending the sorbet.
Blend frozen blackberries with a squeeze of lime or lemon juice and sweetener to taste until creamy, then serve immediately. The key is keeping the berries fully frozen so the blender whips them into a soft-serve texture. Avoid adding extra liquid, which would turn it to slush, and scrape down the sides between short bursts.
Yes, with two swaps. Use a certified gluten-free muesli for the topping and replace the whole wheat flour with oat flour or another gluten-free flour to thicken the filling. You only need a small amount of flour, so the substitution is easy and does not change the texture much.
Keep the baked crumble in an airtight container in the fridge for two to three days, and reheat it gently in the oven to revive some of the crunch, since the muesli topping softens once stored. The sorbet is best fresh; if you freeze it, let it sit at room temperature for a few minutes and re-blend briefly before serving.
So easy to make!
I didn’t expect this to be so flavorful, but I really loved it! Yummy! Great recipe, Ruxandra!
Glad you liked the recipe! 🙂
Will try!
Deliciousness!
Great, original recipe! Will try this for breakfast. Delish!
I love crisps and this looks so delicious! I use arrowroot starch as a thickener in my crisps. Depending on the fruit, I use anywhere from 1-3 Tbls (berries more, apples less).