I just made a Rhubarb Breakfast Cake that tastes like a buttery tart with a sneaky tang, and I’m refusing to tell you why until you keep scrolling.

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I’ll be honest: I’m obsessed with this Rhubarb Sour Cream Coffee Cake. I love how tart chopped rhubarb pokes through a buttery crumb and the sour cream makes it strangely tender.

I call it my go-to Rhubarb Breakfast Cake when I want something that actually tastes like spring but not saccharine. But it’s also the kind of thing I send friends when they’re asking for Recipes With Rhubarb that aren’t weird.

It’s loud, it’s pink, and it ruins other cakes for me. No fuss, just a slice that demands attention.

I eat it for breakfast, lunch, and sometimes before dinner.

Ingredients

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Flour builds tender cake structure.
Baking powder lifts and lightens.
Baking soda helps browning and rise.
Salt brightens flavors, not salty.
Butter, it’s rich and buttery.
Sugar sweetens and helps browning.
Eggs bind and add body.
Vanilla adds warm, homey aroma.
Sour cream makes it moist, tangy.
Rhubarb gives tartness and color.
Plus lemon juice, it’ll add brightness.
Brown sugar gives molasses sweetness.
Flour makes streusel hold together.
Cinnamon adds cozy spice notes.
Pinch of salt balances sweetness.
Cold butter creates flaky streusel.
Basically nuts add crunch and warmth.
Powdered sugar gives glossy sweetness.
Milk thins glaze to drizzle.
Plus vanilla lifts the glaze flavor.

Ingredient Quantities

2 cups all purpose flour

1 1/2 teaspoons baking powder

1/2 teaspoon baking soda

1/2 teaspoon kosher salt

3/4 cup unsalted butter softened (1 1/2 sticks)

1 cup granulated sugar

2 large eggs

1 teaspoon vanilla extract

1 cup sour cream

1 1/2 cups chopped rhubarb (about 6 ounces), stems only

1 tablespoon lemon juice (optional, helps brightness)

For the streusel: 3/4 cup packed light brown sugar

1/2 cup all purpose flour for streusel

1 teaspoon ground cinnamon

1/4 teaspoon salt for streusel

6 tablespoons cold unsalted butter, cut into small cubes (for streusel)

Optional: 1/2 cup chopped walnuts or pecans

Optional glaze: 3/4 cup powdered sugar

Optional glaze: 1 to 2 tablespoons milk or cream

Optional glaze: 1/2 teaspoon vanilla extract

How to Make this

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1. Preheat oven to 350F and grease a 9-inch round or square baking pan, then line with parchment if you got it so the cake comes out easy.

2. Whisk together 2 cups all purpose flour, 1 1/2 tsp baking powder, 1/2 tsp baking soda and 1/2 tsp kosher salt in a medium bowl; set aside.

3. In a large bowl, cream 3/4 cup softened unsalted butter with 1 cup granulated sugar until light and fluffy, it might take 2 to 3 minutes with a hand mixer; beat in 2 large eggs one at a time, then stir in 1 tsp vanilla.

4. Mix in 1 cup sour cream until mostly smooth, then fold in the dry flour mix just until combined; don’t overmix or the cake will be tough.

5. Toss 1 1/2 cups chopped rhubarb with 1 tbsp lemon juice if you like a brighter flavor, then gently fold the rhubarb into the batter so it’s evenly distributed.

6. Pour half the batter into the prepared pan and smooth the top, reserve the other half for a thinner top layer or to dollop on later for a marbled look.

7. Make the streusel by combining 3/4 cup packed light brown sugar, 1/2 cup flour, 1 tsp ground cinnamon and 1/4 tsp salt; cut in 6 tbsp cold cubed butter with a pastry cutter or fingers until mixture looks like coarse crumbs; stir in 1/2 cup chopped walnuts or pecans if using.

8. Sprinkle about two thirds of the streusel over the batter in the pan, then dollop or spread the remaining batter over that and finish with the rest of the streusel on top so you get crunchy pockets.

9. Bake 40 to 50 minutes until the top is golden and a toothpick in the center comes out with just a few moist crumbs; cool in the pan 15 minutes then transfer to a wire rack to cool further.

10. If you want the optional glaze, whisk 3/4 cup powdered sugar with 1 to 2 tbsp milk or cream and 1/2 tsp vanilla until pourable; drizzle over cooled cake. Slice and serve, cake keeps covered at room temp for 2 days or in the fridge up to 4 days.

Equipment Needed

1. Oven (preheated to 350F)
2. 9-inch round or square baking pan
3. Parchment paper (optional, but helps release)
4. Mixing bowls (one medium, one large)
5. Measuring cups and spoons
6. Hand mixer or stand mixer
7. Whisk and rubber spatula
8. Pastry cutter or forks for the streusel
9. Wire cooling rack and a knife for slicing

FAQ

Q: How do I keep the cake from getting soggy with the rhubarb?
A: Toss the chopped rhubarb with the tablespoon of lemon juice and a tablespoon of flour before folding it in. That draws out a little moisture and helps the fruit not sink or make the crumb wet. Also dont overmix the batter; fold gently so you dont release more liquid.

Q: Can I swap Greek yogurt for the sour cream?
A: Yes, plain full fat Greek yogurt works fine and gives a similar tang and moisture. If using low fat yogurt the cake may be slightly less tender, so watch the baking time.

Q: Can I use frozen rhubarb?
A: You can, but thaw and drain it well and pat dry so you dont add extra water to the batter. Toss frozen rhubarb in a tablespoon of flour too, that helps absorb remaining juice.

Q: How do I store and freeze the cake?
A: Store loosely covered at room temp for 2 days, or refrigerate up to 5 days. To freeze, wrap slices or the whole cooled cake tightly in plastic then foil and freeze up to 3 months. Thaw overnight in the fridge or at room temp for a few hours.

Q: Do I have to add the optional nuts or glaze?
A: Nope, both are optional. Nuts add crunch and a toasty flavor, but if you dont like them just skip. The glaze brightens the top and adds sweetness; if you prefer less sweet leave it off or drizzle less.

Q: My streusel melts into the batter during baking. How do I keep it crunchy?
A: Make sure streusel butter stays cold until you mix it in, and use a fork or your fingers to make coarse crumbles. Sprinkle the streusel on top of slightly chilled batter, not warm batter, and bake immediately. If your oven runs hot, tent with foil for the last 10 minutes so the top doesnt burn while center finishes.

Rhubarb Sour Cream Coffee Cake Recipe Substitutions and Variations

All purpose flour: swap for whole wheat pastry flour 1:1 for a nuttier, slightly denser cake. It will brown faster so watch baking time, and the texture may be a bit more crumbly.
Sour cream: use plain Greek yogurt 1:1. Same tang and moisture, maybe a touch thicker so stir it smooth before folding in.
Unsalted butter (batter): you can use neutral oil like canola or avocado oil at 7/8 the amount (so about 2/3 cup instead of 3/4 cup) for a moister crumb. Note the streusel still needs cold solid butter for chunks if you want that crunch.
Chopped rhubarb: if out of season use chopped strawberries or tart apples for similar brightness, or frozen rhubarb (thaw and drain well) to keep the same flavor profile.

Pro Tips

1. Chill the rhubarb briefly before folding it in so it stays firmer and sinks less; toss it in a little cornstarch if it seems extra juicy to prevent a soggy center.

2. Don’t overmix after adding the flour and sour cream. Stop when you see no more streaks of flour; a few lumps are fine — overworking makes the cake dense.

3. Use cold butter and work it into the streusel with your fingertips or a fork until pea-size clumps form. Those chunks give the best crunchy pockets, and chilling the streusel 10 minutes before sprinkling helps it hold shape during baking.

4. If the top browns too fast, tent loosely with foil for the last 10 to 15 minutes. Also let the cake cool in the pan for at least 15 minutes before lifting so it doesn’t fall apart, and wait until mostly cool before glazing so the drizzle stays pretty.

Rhubarb Sour Cream Coffee Cake Recipe

Recipe by Sarah level

0.0 from 0 votes

I just made a Rhubarb Breakfast Cake that tastes like a buttery tart with a sneaky tang, and I'm refusing to tell you why until you keep scrolling.

Servings

servings

Calories

414

kcal

Equipment: 1. Oven (preheated to 350F)
2. 9-inch round or square baking pan
3. Parchment paper (optional, but helps release)
4. Mixing bowls (one medium, one large)
5. Measuring cups and spoons
6. Hand mixer or stand mixer
7. Whisk and rubber spatula
8. Pastry cutter or forks for the streusel
9. Wire cooling rack and a knife for slicing

Ingredients

2 cups all purpose flour
1 1/2 teaspoons baking powder
1/2 teaspoon baking soda
1/2 teaspoon kosher salt
3/4 cup unsalted butter softened (1 1/2 sticks)
1 cup granulated sugar
2 large eggs
1 teaspoon vanilla extract
1 cup sour cream
1 1/2 cups chopped rhubarb (about 6 ounces), stems only
1 tablespoon lemon juice (optional, helps brightness)
For the streusel: 3/4 cup packed light brown sugar
1/2 cup all purpose flour for streusel
1 teaspoon ground cinnamon
1/4 teaspoon salt for streusel
6 tablespoons cold unsalted butter, cut into small cubes (for streusel)
Optional: 1/2 cup chopped walnuts or pecans
Optional glaze: 3/4 cup powdered sugar
Optional glaze: 1 to 2 tablespoons milk or cream
Optional glaze: 1/2 teaspoon vanilla extract

Directions

Preheat oven to 350F and grease a 9-inch round or square baking pan, then line with parchment if you got it so the cake comes out easy.
Whisk together 2 cups all purpose flour, 1 1/2 tsp baking powder, 1/2 tsp baking soda and 1/2 tsp kosher salt in a medium bowl; set aside.
In a large bowl, cream 3/4 cup softened unsalted butter with 1 cup granulated sugar until light and fluffy, it might take 2 to 3 minutes with a hand mixer; beat in 2 large eggs one at a time, then stir in 1 tsp vanilla.
Mix in 1 cup sour cream until mostly smooth, then fold in the dry flour mix just until combined; don’t overmix or the cake will be tough.
Toss 1 1/2 cups chopped rhubarb with 1 tbsp lemon juice if you like a brighter flavor, then gently fold the rhubarb into the batter so it’s evenly distributed.
Pour half the batter into the prepared pan and smooth the top, reserve the other half for a thinner top layer or to dollop on later for a marbled look.
Make the streusel by combining 3/4 cup packed light brown sugar, 1/2 cup flour, 1 tsp ground cinnamon and 1/4 tsp salt; cut in 6 tbsp cold cubed butter with a pastry cutter or fingers until mixture looks like coarse crumbs; stir in 1/2 cup chopped walnuts or pecans if using.
Sprinkle about two thirds of the streusel over the batter in the pan, then dollop or spread the remaining batter over that and finish with the rest of the streusel on top so you get crunchy pockets.
Bake 40 to 50 minutes until the top is golden and a toothpick in the center comes out with just a few moist crumbs; cool in the pan 15 minutes then transfer to a wire rack to cool further.
If you want the optional glaze, whisk 3/4 cup powdered sugar with 1 to 2 tbsp milk or cream and 1/2 tsp vanilla until pourable; drizzle over cooled cake. Slice and serve, cake keeps covered at room temp for 2 days or in the fridge up to 4 days.

Notes

Below you’ll find my best estimate of this recipe’s nutrition facts. Treat the numbers as a guide rather than a rule—great food should nourish both body and spirit. Figures are approximate, and the website owner assumes no liability for any inaccuracies in this recipe.