This Old-Fashioned Berry Rhubarb Cake is a tender, simple cake with a bright fruit layer and a buttery streusel topping. It’s the kind of bake I like when I want something that feels familiar but still tastes a little special.
The flavor is a mix of tangy rhubarb and sweet berries with a soft, lightly rich crumb (thank you, sour cream). I really like the contrast between the crunchy cinnamon streusel and the juicy fruit.
For me, this is a great weekend cake for coffee or an easy dessert for spring and early summer. It also slices nicely once it’s fully cooled, which makes it easy to set out and let people grab a piece.
Why You’ll Love This Recipe
Classic and simple: It’s an old-fashioned style cake with a straightforward batter, not fussy layers or frosting.
Great fruit flavor: Rhubarb brings that tart bite, and the mixed berries round it out so it tastes balanced and fresh.
That streusel top: The cinnamon-brown sugar crumble bakes up crisp and buttery, and it’s honestly the reason I keep coming back to this recipe.
Works with fresh or frozen: Fresh fruit is great, but frozen berries work well too, which is handy outside peak season.
Easy to serve: It looks nice in a springform pan, but it’s just as practical in a square pan for casual slicing.
Ingredients You’ll Need
Fruit
- Rhubarb: I like it diced fairly small so it softens nicely as the cake bakes. If your stalks are very thick, split them lengthwise first.
- Mixed berries: Use whatever mix you like—strawberries, blueberries, raspberries, blackberries. Frozen berries are totally fine here; just don’t thaw them first.
- Granulated sugar: This takes the edge off the rhubarb and helps the fruit taste more rounded.
- All-purpose flour: A little flour helps the fruit juices thicken up instead of turning watery in the cake.
- Lemon zest: Don’t skip it if you have a lemon. It makes the fruit taste brighter without making the cake taste lemony.
Cake Batter
- All-purpose flour: I use regular flour here. Spoon and level it if you tend to pack your measuring cup.
- Baking powder: This gives the cake most of its lift.
- Baking soda: Works with the sour cream to help the crumb rise and stay tender.
- Fine salt: Needed to keep the cake from tasting flat, especially with the sweet topping.
- Unsalted butter: Softened butter creams best with sugar and gives the cake that old-fashioned richness.
- Granulated sugar: I keep it simple with white sugar in the batter. If your berries are very sweet, you can cut it back a bit.
- Eggs: Use large eggs. They help the cake hold together with all that fruit.
- Vanilla extract: Plain vanilla is perfect here. It adds that warm background flavor.
- Sour cream or plain Greek yogurt: This is what makes the crumb soft and slightly rich. Full-fat is my preference, but low-fat works in a pinch.
- Milk: Only needed if your batter feels extra thick. A splash helps it spread evenly in the pan.
Streusel Topping
- All-purpose flour: This is the base of the crumble topping.
- Brown sugar: I like the deeper flavor here. Light or dark brown sugar both work.
- Ground cinnamon: Just enough to make the topping taste like a proper coffee cake.
- Fine salt: A small amount makes the topping taste more buttery.
- Unsalted butter: Cold butter is important so the streusel stays crumbly instead of melting into the batter.
- Old fashioned oats: Optional, but I like what they do. They add a little extra crunch and make the topping feel more substantial.
Recipe Instructions
- Preheat the oven: Heat the oven to 350°F. Grease and flour a 9-inch springform pan, or line a 9×9-inch pan with parchment paper.
- Mix the fruit: Toss the diced rhubarb and mixed berries with the granulated sugar, flour, and lemon zest. Set aside 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 light and fluffy.
- Add the eggs: Beat in the eggs one at a time, then mix in the vanilla.
- Add the sour cream: Mix in the sour cream (or Greek yogurt) until combined.
- Add the dry ingredients: Add the flour mixture in two additions, mixing just until you no longer see dry flour. If the batter seems very thick, add milk a tablespoon at a time just until it loosens up.
- Fold in the fruit: Gently fold in the rhubarb and berries, then spread the batter evenly in the prepared pan.
- Make the streusel: In a bowl, combine the streusel flour, brown sugar, cinnamon, salt, and oats (if using). Cut in the cold butter until the mixture looks crumbly.
- Add the topping: Sprinkle the streusel evenly over the top of the batter.
- Bake: Bake for 40 to 55 minutes, until the top is golden and a toothpick comes out clean or with a few moist crumbs.
- Let cool: Cool for 15 minutes before slicing. Let it cool completely if you want clean, neat slices.
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
Dice the rhubarb small. Big chunks can stay firm and a little stringy. Smaller pieces soften into the cake and are nicer to slice through.
Don’t thaw frozen berries. Thawed berries can get watery fast and streak the batter. Use them straight from the freezer and plan on adding 5 to 10 minutes to the bake time.
Stop mixing once the flour is in. Overmixing makes this kind of cake bake up tougher. Mix just until you don’t see dry flour, then fold the fruit in gently.
Use cold butter for the streusel. If the butter is soft, the topping can melt into the cake instead of staying crumbly. I usually dice it and keep it in the fridge until I’m ready.
Check the center, not just the edges. The edges can look done while the middle still needs time because of the fruit. A toothpick in the center should come out clean or with a few moist crumbs.
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
- Whipped cream: A dollop of lightly sweetened whipped cream is simple and really nice with the tart rhubarb. I usually add just a little vanilla to it.
- Ice cream: Vanilla ice cream on the side is great if you’re serving this as dessert. Let the cake sit at room temp for a bit, or warm slices briefly if you want it softer.
- Extra berries: Fresh berries on the plate make it feel a little more special and help if your mix is more rhubarb-heavy. A few sliced strawberries are especially good.
- Coffee or tea: This is a classic coffee cake situation. I like it with black coffee or plain tea so the fruit stands out.
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 if your kitchen isn’t too warm. After that, I move it to the fridge since the fruit keeps it pretty moist.
Refrigerate leftovers for up to 4 days. The streusel softens a bit in the fridge, but it still tastes great.
To serve, I usually rewarm slices briefly in the microwave, just until the chill is off. You can also let slices sit out for 20 to 30 minutes.
If you want to make this cake ahead for guests, bake it the day before and keep it covered in the fridge. It slices cleaner the next day anyway.
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 all strawberries instead of mixed berries?
Yes. Strawberries and rhubarb are a classic combo. If the strawberries are very sweet, I’d reduce the sugar in the fruit mixture by a couple tablespoons.
Should I peel rhubarb?
Usually no. If the stalks are very thick or stringy, you can peel off a couple of the tougher outer strings, but most grocery-store rhubarb doesn’t need it.
Can I swap the sour cream for yogurt or buttermilk?
Plain Greek yogurt works well and keeps the crumb tender. Buttermilk also works, but the batter can feel a little looser, so don’t add extra milk unless you really need it.
How do I know when it’s done with all that fruit in the middle?
Look for a golden top and set edges, then test the center with a toothpick. It should come out clean or with a few moist crumbs (not wet batter), and the center should feel set when you lightly press it.
Can I bake this in a springform pan and still get clean slices?
Yes, and I like springform for a nice presentation. For the cleanest slices, let the cake cool completely before cutting.
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
Old-Fashioned Berry Rhubarb Cake
INGREDIENTS
Fruit
- 2 cups rhubarb diced
- 1 1/2 cups mixed berries fresh or frozen
- 2 tbsp granulated sugar
- 1 tbsp all purpose flour
- 1 tsp lemon zest.
Cake Batter
- 2 cups all purpose flour
- 2 tsp baking powder
- 1/2 tsp baking soda
- 1/2 tsp fine salt
- 1/2 cup unsalted butter softened
- 1 cup granulated sugar
- 2 large eggs
- 2 tsp vanilla extract
- 1 cup sour cream or plain Greek yogurt
- 2 tbsp milk as needed.
Streusel Topping
- 1/2 cup all purpose flour
- 1/2 cup brown sugar packed
- 1/2 tsp ground cinnamon
- 1/4 tsp fine salt
- 6 tbsp unsalted butter cold diced
- 1/2 cup old fashioned oats optional.
INSTRUCTIONS
Prepare
- heat oven to 350 F
- grease and flour a 9 inch springform pan or line a 9x9 inch pan with parchment
- toss rhubarb and berries with granulated sugar flour and lemon zest then set aside.
Mix Batter and Assemble
- whisk flour baking powder baking soda and salt
- cream butter and sugar until light and fluffy
- beat in eggs one at a time then mix in vanilla
- add dry ingredients in two additions alternating with sour cream and mix just until combined adding milk only if batter is very thick
- fold in the fruit gently and spread batter evenly in pan.
Streusel and Bake
- combine streusel flour brown sugar cinnamon salt and oats then cut in butter until crumbly
- sprinkle streusel evenly over batter
- bake until golden and a toothpick comes out clean or with a few moist crumbs 40 to 55 minutes
- cool 15 minutes before slicing and cool completely for clean cuts.
