Why You’ll Love Rhubarb Coffee Cake Recipe

This cake has everything that makes a homemade coffee cake so satisfying. The crumb is rich and tender thanks to the butter, eggs, and Greek yogurt, while the rhubarb adds a bright, tangy contrast that keeps every bite from feeling too heavy. The streusel topping brings a delicate crunch and a warm hint of cinnamon that pairs wonderfully with the fruit.

You will also love that it makes a generous 9×13-inch pan, which means it is ideal for sharing with family, bringing to gatherings, or preparing ahead for the week. Even though it looks impressive, the method is simple and straightforward, making it a great recipe for both beginner and experienced bakers.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

For the streusel:
1 ⅓ cups flour, plus a few tablespoons as needed
½ cup sugar
¼ teaspoon ground cinnamon
Pinch of salt
1 stick cold butter

For the cake:
1 ½ sticks butter, softened
1 cup sugar
3 large eggs
1 cup Greek yogurt
2 teaspoons vanilla extract
3 cups flour
1 ½ teaspoons baking powder
½ teaspoon ground cinnamon
¼ teaspoon salt
2 pounds rhubarb, cut into 1/2-inch pieces

Directions

Start by lining a 9×13-inch cake pan and preheating your oven to 360°F (180°C). Having the pan ready before mixing will make assembly much easier once the batter is finished.

To make the streusel, combine the flour, sugar, cinnamon, and salt in a small bowl. Cut in the cold butter until the mixture forms crumbs. Place the bowl in the refrigerator while you prepare the cake batter so the topping stays cold and crumbly.

In a large mixing bowl, cream the softened butter, sugar, and eggs together until the mixture becomes light and fluffy. This step is important for the cake’s texture and rise, so give it a full 4 to 5 minutes. Once the mixture is airy, slowly beat in the Greek yogurt and vanilla extract.

In a separate bowl, whisk together the flour, baking powder, cinnamon, and salt. Gradually add the dry ingredients to the wet mixture, mixing until a smooth, thick batter forms.

Spread the batter evenly into the prepared cake pan. Arrange the rhubarb pieces across the top, pressing them in slightly so they nestle into the batter. Finish by scattering the chilled streusel evenly over the surface.

Bake for 50 to 60 minutes, or until a toothpick inserted into the center comes out fairly clean. Let the cake cool in the pan on a wire rack before slicing and serving.

Servings and timing

This recipe makes 15 servings, making it a great option for brunch tables, potlucks, and family desserts.

Preparation and baking time takes about 1 hour and 10 minutes total. That includes the mixing, assembly, and a bake time of about 50 to 60 minutes, plus a little cooling time before slicing.

Variations

One easy variation is to add chopped strawberries to the rhubarb for a sweeter, more classic fruit combination. This gives the cake a softer, jammy flavor that many people love during spring and early summer.

For added texture, try mixing chopped pecans or walnuts into the streusel. Nuts add a deeper flavor and a little extra crunch on top.

You can also change the flavor profile slightly by adding a bit of lemon zest or orange zest to the batter. Citrus works especially well with rhubarb and brings a fresh brightness to the cake.

If you prefer a slightly sweeter finish, dust the cooled cake with powdered sugar before serving. It adds a simple decorative touch without overpowering the tart fruit.

Storage/Reheating

Store the cake tightly covered at room temperature for up to 2 days if your kitchen is cool. For longer storage, keep it in the refrigerator for up to 5 days. Because of the rhubarb and yogurt, refrigeration helps maintain freshness.

To reheat, warm individual slices in the microwave for about 10 to 15 seconds. You can also place slices in a low oven for a few minutes to refresh the texture and slightly crisp the topping again.

This cake also freezes well. Wrap individual slices or the whole cake tightly and freeze for up to 2 months. Thaw in the refrigerator overnight or at room temperature before serving.

FAQs

Can I use frozen rhubarb instead of fresh?

Yes, frozen rhubarb can be used. Thaw it first and drain off excess liquid so the cake does not become too wet.

Why is my batter so thick?

This batter is supposed to be thick. That helps support the rhubarb and creates the sturdy yet tender texture of the finished cake.

Can I substitute sour cream for Greek yogurt?

Yes, sour cream is a good substitute for Greek yogurt and will give a similarly moist and rich result.

Do I need to peel the rhubarb?

No, rhubarb usually does not need peeling. Simply trim the ends and cut it into pieces.

How do I know when the cake is done?

Insert a toothpick into the center. If it comes out fairly clean with just a few moist crumbs, the cake is ready.

Can I make this cake ahead of time?

Yes, this cake is a great make-ahead dessert. In fact, the flavor is often even better after it has rested for several hours.

What size pan should I use?

A 9×13-inch pan is ideal for this recipe and gives the cake the right thickness for even baking.

Can I reduce the sugar?

You can reduce the sugar slightly, but keep in mind that rhubarb is naturally tart, so the sweetness helps balance the flavor.

Why should the streusel be chilled?

Chilling keeps the butter cold, which helps the streusel stay crumbly and gives the topping a better texture during baking.

Can I serve this cake warm?

Yes, it is delicious slightly warm or fully cooled. Warm slices are especially good with coffee or a spoonful of whipped cream.

Conclusion

Rhubarb coffee cake is a wonderful way to showcase rhubarb in a simple, crowd-pleasing dessert. With its tender buttery crumb, tart fruit layer, and crisp cinnamon streusel, it delivers a perfect balance of flavor and texture. Whether you serve it for brunch, dessert, or a cozy afternoon treat, this cake is sure to become a favorite seasonal bake.