Moist Rhubarb Coffee Cake with Brown Sugar Streusel
This moist rhubarb coffee cake is packed with tart fresh rhubarb, a tender crumb, and a buttery brown sugar streusel topping that makes it perfect for breakfast, brunch, or dessert.
The Only Rhubarb Coffee Cake Recipe You Will Ever Need
Every spring, when those bold red stalks start showing up at the farmers market, my kitchen fills with the kind of baking excitement that only rhubarb season brings. This moist rhubarb coffee cake has become my most-requested recipe among friends and family, and once you taste it, you will completely understand why.
It has everything you want in a rhubarb breakfast cake: a pillowy, tender crumb, generous pockets of tart rhubarb, and a buttery brown sugar streusel on top that bakes into a satisfying, crunchy crust. Whether you serve it warm from the oven with a cup of coffee or bring it to a weekend brunch, it disappears fast.
Why This Fresh Rhubarb Coffee Cake Works So Well
The secret to keeping this cake incredibly moist is full-fat sour cream. It adds richness and a gentle tang that plays beautifully against the tartness of the rhubarb, keeping every bite tender rather than dry or crumbly.
The rhubarb itself does not need to be pre-cooked or macerated. Just dice it small, fold it straight into the batter, and it softens perfectly during baking while releasing just enough juice to create those gorgeous, jammy pockets throughout the cake.
If you have been searching for new rhubarb ideas or wondering what to make with rhubarb beyond the usual pie, this is your answer. It is also one of the most approachable rhubarb recipes out there because the method is genuinely simple.
Chef's Tip: Do not skip chilling the streusel while you mix the batter. Cold butter is what gives the topping those satisfying clumps rather than a sandy, flat layer.
The Right Tools Make a Real Difference
A good hand mixer or stand mixer will get your butter and sugar perfectly creamed in minutes, and a quality 9x13-inch pan with straight sides ensures even baking from edge to center. Using the right equipment here helps the streusel stay on top rather than sinking in.
Sourdough Discard Variation
If you keep a sourdough starter, this is one of the best sourdough discard rhubarb cake recipes to add to your rotation. Simply swap half of the sour cream for an equal amount of unfed sourdough discard. It adds a subtle depth of flavor and keeps the crumb just as tender. No starter? No problem. The classic version with all sour cream is equally delicious.
Strawberry Rhubarb Ideas
Want to lean into classic recipes with strawberry and rhubarb together? Replace about half a cup of the rhubarb with fresh diced strawberries. The berries add natural sweetness and a beautiful color contrast throughout the cake. It is one of the easiest and most crowd-pleasing twists on this rhubarb recipe.
Note: If using frozen rhubarb, add it directly from the freezer without thawing. Thawed rhubarb releases too much liquid and can make the batter watery.
Ready to bake the most tender, flavorful rhubarb cake of your life? Here is everything you need:
Moist Rhubarb Coffee Cake with Brown Sugar Streusel
This moist rhubarb coffee cake is packed with tart fresh rhubarb, a tender crumb, and a buttery brown sugar streusel topping that makes it perfect for breakfast, brunch, or dessert.
Ingredients
- 2 cups all-purpose flour, spooned and leveled
- 1 tsp baking powder
- 1/2 tsp baking soda
- 1/2 tsp salt
- 1 tsp ground cinnamon
- 1/2 cup unsalted butter, softened to room temperature
- 3/4 cup granulated sugar
- 2 large eggs, room temperature
- 1 tsp vanilla extract, pure, not imitation
- 1 cup sour cream, full-fat for best moisture
- 2 cups fresh rhubarb, trimmed and diced into 0.5-inch pieces
- 3/4 cup all-purpose flour, for streusel topping
- 1/2 cup packed brown sugar, for streusel topping
- 1/2 tsp ground cinnamon, for streusel topping
- 4 tbsp cold unsalted butter, cubed, for streusel topping
Instruction
Preheat your oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking pan with butter or nonstick spray and set aside.
Make the streusel topping: In a small bowl, combine 0.75 cup flour, brown sugar, and 0.5 tsp cinnamon. Add the cold cubed butter and use your fingertips to rub it in until the mixture resembles coarse, clumpy crumbs. Refrigerate while you prepare the batter.
In a medium bowl, whisk together the flour, baking powder, baking soda, salt, and cinnamon. Set aside.
In a large bowl, beat the softened butter and granulated sugar together with a hand mixer or stand mixer on medium speed for 2 to 3 minutes until light and fluffy.
Add the eggs one at a time, beating well after each addition. Mix in the vanilla extract.
Reduce the mixer to low speed and add the flour mixture in three additions, alternating with the sour cream, beginning and ending with the flour. Mix just until combined. Do not overmix.
Gently fold the diced rhubarb into the batter using a rubber spatula.
Spread the batter evenly into the prepared pan. Remove the streusel from the refrigerator and sprinkle it evenly over the top of the batter.
Bake for 40 to 45 minutes, or until a toothpick inserted into the center comes out clean and the streusel is golden brown.
Let the cake cool in the pan for at least 15 minutes before slicing and serving. Enjoy warm or at room temperature.
Equipment
- 9x13-inch baking pan
- Large mixing bowl
- Medium mixing bowl
- Small mixing bowl
- Hand mixer or stand mixer
- Rubber spatula
- Whisk
- Toothpick or cake tester
Notes
Serving and Storing Your Rhubarb Coffee Cake
This cake is wonderful served slightly warm with a dusting of powdered sugar or a dollop of lightly sweetened whipped cream. For a more indulgent rhubarb breakfast cake experience, a drizzle of vanilla glaze over the still-warm streusel is absolutely worth it.
Leftovers keep covered at room temperature for 2 days or refrigerated for up to 5 days. Individual slices also freeze beautifully for up to 2 months, making this one of the most practical rhubarb recipes to bake in a big batch and enjoy all season long.
