Berry Rhubarb Cake is a moist butter cake with a tart fruit layer and a cinnamon crumb topping that bakes up golden and crisp. It’s the kind of cake I like when I want something simple and snacky but still a little special.
The rhubarb gives it that sharp, tangy bite, and the berries soften into jammy pockets as it bakes. Sour cream in the batter keeps the crumb tender and sturdy, so it slices cleanly even with all that fruit.
For me, this is best as a late-morning cake with coffee or as an easy dessert when you want something that doesn’t need frosting. A little powdered sugar at the end is all it needs.
Why You’ll Love This Recipe
Tart fruit flavor: Rhubarb keeps the cake from tasting flat, and the berries add a softer sweetness that works really well with it.
Soft, buttery crumb: This cake stays moist and tender, even the next day, thanks to the sour cream in the batter.
Crumb topping: The cinnamon streusel is crisp on top and a little sandy in the best way. It gives you texture without needing a glaze or frosting.
Easy to serve: It looks nice in a springform pan, but it’s still casual enough to slice and set out for people to grab.
Flexible with fruit: Fresh or frozen berries both work, so you can bake it when rhubarb is in season and still use whatever berries you have.
Ingredients You’ll Need
Pan and fruit
- Unsalted butter – This is just for greasing the pan. I still like to butter the pan even if I’m using parchment because it helps the sides release cleanly.
- Rhubarb – Use the stalks only (no leaves). I like a small dice so it softens into the cake instead of leaving big tangy chunks.
- Mixed berries – Fresh is great, but frozen works too. I like a mix with blueberries and raspberries, and strawberries are nice if you dice them smaller.
- Granulated sugar – This lightly sweetens the fruit so the rhubarb doesn’t come across too sharp.
- Cornstarch – Helps the fruit juices thicken a bit so the cake doesn’t get soggy in the middle.
Cake batter
- All-purpose flour – Regular flour is what I use here. Spoon and level if you tend to pack flour into the cup.
- Baking powder – Gives the cake most of its lift.
- Baking soda – Works with the sour cream to help the crumb rise and stay tender.
- Kosher salt – Don’t skip it. It keeps the cake from tasting one-note.
- Unsalted butter – Softened butter creams better and gives you a lighter texture. If it’s greasy-melty, the batter can feel loose.
- Granulated sugar – Classic choice for a clean sweetness in the cake.
- Eggs – Bring them to room temp if you can so they mix in smoothly.
- Vanilla extract – I like a full vanilla flavor here since the fruit is tart.
- Sour cream – This is what keeps the cake moist and rich. Plain Greek yogurt is a good swap.
- Milk – Just enough to loosen the batter so it spreads without overmixing.
Crumb topping
- All-purpose flour – This is the base of the streusel. It should look sandy before you add enough butter to make clumps.
- Light brown sugar – Gives a warmer sweetness and helps the crumb topping brown nicely.
- Ground cinnamon – A little cinnamon is all you need with rhubarb and berries.
- Kosher salt – A pinch keeps the topping from tasting overly sweet.
- Unsalted butter – Cold butter is the trick for chunky crumbs. If it’s soft, the topping mixes into a paste.
Finish
- Powdered sugar – Totally optional, but I like it for a simple finish. It also makes the cake look a little more “done” without extra effort.
Recipe Instructions
- Preheat the oven: Heat the oven to 350°F. Grease a 9-inch springform pan (or 9-inch round cake pan) and line the base with parchment.
- Mix the fruit: Toss the diced rhubarb and mixed berries with the granulated sugar and cornstarch. Set aside while you make the batter.
- Make the crumb topping: Mix the flour, brown sugar, cinnamon, and salt until combined. Cut in the cold butter until you have pea-size clumps, then refrigerate the topping while you mix the batter.
- Mix the dry ingredients: Whisk the flour, baking powder, baking soda, and salt together in a medium bowl.
- Cream the butter and sugar: Beat the softened butter and granulated sugar until pale and fluffy.
- Add the eggs and vanilla: Beat in the eggs one at a time, then mix in the vanilla extract.
- Add the sour cream: Mix in the sour cream until smooth.
- Add the flour and milk: Add the dry ingredients alternately with the milk, mixing just until you don’t see dry streaks.
- Fold in the fruit: Gently fold in the fruit mixture until it’s evenly distributed.
- Fill the pan: Spread the batter into the prepared pan and smooth the top.
- Add the crumb topping: Sprinkle the chilled crumb topping evenly over the surface.
- Bake: Bake for about 50 minutes, until the center is set and a toothpick comes out with moist crumbs.
- Cool: Cool the cake in the pan for 15 minutes, then unmold and cool completely.
- Finish and slice: Dust with powdered sugar before slicing and serving.
Some of my tips!
This is the part that really makes a difference. If you only read one section, make it this one because this is where I share the little trick that helps the recipe turn out so well.
Recipe Tips & Tricks
Use rhubarb stalks only. Rhubarb leaves aren’t edible, so stick to the stalks. If your stalks are very thick, I usually slice them lengthwise once before dicing.
Keep frozen berries mostly frozen. If they thaw completely, they can bleed into the batter and make it looser. I toss them with the rhubarb and get them into the batter quickly.
Don’t overmix after the flour goes in. Mix just until the last dry streaks disappear. Overmixing makes the crumb tighter and less tender.
Tent with foil if the topping gets dark. If your crumb topping is browning faster than the center is setting, lay a piece of foil loosely over the top for the last part of baking.
Watch the center, not the edges. The edges set first, especially in a springform pan. I pull this when the center looks set and a toothpick comes out with moist crumbs, not wet batter.
Make some touches!
There are plenty of easy ways to serve this depending on the occasion. Keep it simple, or add a few small touches to make it feel a little more special.
Serving Suggestions
- Coffee or tea: This is one of my favorite cakes to have with coffee, especially in the morning. A plain black coffee or an Earl Grey works well.
- Whipped cream: A small dollop on the side is nice if you’re serving it as dessert. I keep it simple and barely sweeten it.
- Vanilla ice cream: If you want to dress it up, serve a slice with vanilla ice cream. The cold ice cream with the tangy fruit is a good combo.
- Extra berries: A handful of fresh berries on the plate makes it look pretty and adds a little freshness. Strawberries are especially good here.
Save it for later
This section covers how to store leftovers and what parts of the recipe you can prepare ahead of time.
Storage and Make Ahead
Store leftovers covered at room temperature for 1 day. After that, I move it to the fridge so the fruit stays nice and the cake doesn’t get too soft.
Store leftovers covered in the fridge for up to 4 days. I like it cold, but you can also let a slice sit out for 15 to 20 minutes so the crumb softens slightly.
If you want to make this recipe ahead, bake it the day before and dust with powdered sugar right before serving. The topping stays crispest that way.
If you want them to last longer, you can freeze individual portions wrapped well. Thaw in the fridge overnight and bring to room temp before serving.
A few quick answers
This section covers a few extra details that may help before you head to the recipe card.
Recipe FAQs
Can I use frozen berries in this cake?
Yes. I’d keep the berries mostly frozen when you mix them with the rhubarb so they don’t leak a lot of juice into the batter right away.
If the batter seems a little loose (it can happen depending on the berries), add 1 extra tablespoon of flour.
Can I swap the sour cream for Greek yogurt?
You can. Plain Greek yogurt works really well here and gives a similar tang and moisture. I usually use full-fat, but low-fat is fine too.
What pan works best if I don’t have a springform pan?
A 9-inch round cake pan works. Line the bottom with parchment so it’s easier to lift out, and let it cool a bit before turning it out.
How do I know when it’s done?
The center should look set (not jiggly), and a toothpick should come out with moist crumbs. If you hit a berry pocket, test again in a nearby spot.
Can I use only rhubarb or only berries?
You can, but the balance is nicer with both. All rhubarb will taste sharper, and all berries will be sweeter and softer; either way, keep the total fruit amount about the same so the cake bakes through.
You might also like
Before you go, take a look at a few other recipes below the recipe card. They use similar ingredients in a different way and are worth saving too.
MORE DINNER RECIPES TO TRY
Berry Rhubarb Cake
INGREDIENTS
Pan and fruit
- 1 tbsp unsalted butter for greasing pan
- 2 cups rhubarb diced
- 1.5 cups mixed berries fresh or frozen
- 2 tbsp granulated sugar
- 1 tbsp cornstarch.
Cake batter
- 2 cups all purpose flour
- 1.5 tsp baking powder
- ½ tsp baking soda
- ½ tsp kosher salt
- ¾ cup unsalted butter softened
- 1 cup granulated sugar
- 2 large eggs
- 2 tsp vanilla extract
- 1 cup sour cream
- ¼ cup milk.
Crumb topping
- ¾ cup all purpose flour
- ½ cup light brown sugar packed
- ½ tsp ground cinnamon
- ¼ tsp kosher salt
- 6 tbsp unsalted butter cold cubed.
Finish
- powdered sugar for dusting.
INSTRUCTIONS
Prep
- Heat oven to 350 F
- Grease a 9 inch springform pan or 9 inch round cake pan and line base with parchment
- Toss rhubarb and berries with granulated sugar and cornstarch and set aside.
Crumb topping
- Mix crumb flour brown sugar cinnamon and salt until combined
- Cut in cold butter until pea size clumps form and refrigerate while mixing batter.
Batter and assembly
- Whisk flour baking powder baking soda and salt
- Cream softened butter and sugar until pale and fluffy
- Beat in eggs one at a time then mix in vanilla
- Mix in sour cream until smooth
- Add dry ingredients alternately with milk just until no dry streaks remain
- Fold in fruit mixture gently
- Spread batter in pan and sprinkle crumb topping evenly over the surface.
Bake and cool
- Bake until the center is set and a toothpick comes out with moist crumbs 50 minutes
- Cool in pan 15 minutes then unmold and cool completely
- Dust with powdered sugar before slicing.
