Oma’s Rhubarb Cake

Oma’s Rhubarb Cake is the kind of old-fashioned bake that makes your whole kitchen smell like a warm hug. Hey there, I’m Claire Whitmore — a pastry whisperer in Asheville, NC, where butter totally counts as self-care.

This rhubarb cream cake recipe combines tangy fresh rhubarb, a tender sour cream crumb, and a buttery cinnamon streusel topping. It comes together in under an hour with simple pantry staples — no fancy equipment, no stress.

I first made this cake when my neighbor dropped off a giant armful of rhubarb stalks from her garden. I had no idea what to do with them, honestly. Then I found this recipe tucked into an old handwritten card at the back of my recipe box, and I haven’t looked back since.

Little Snapshot: What This Recipe Delivers

Oma’s Rhubarb Cake is a simple sheet cake made with diced fresh rhubarb, sour cream, and a sweet cinnamon streusel topping. It bakes in a 9×13 pan in about 45 minutes, serves 12, and lands somewhere between a coffee cake and a classic fruit cake.

It’s easy enough for beginners, tart enough to feel interesting, and sweet enough that even rhubarb skeptics go back for seconds.

Nutritional Peek

Here’s a general breakdown per serving based on the ingredients used. Exact values may vary slightly depending on your brands.

Nutrient	Amount Per Serving
Calories	~295 kcal
Carbohydrates	~50 g
Protein	~4 g
Fat	~9 g
Saturated Fat	~5 g
Fiber	~1 g
Sugar	~32 g

Ingredients for the Best Rhubarb Cream Cake Recipe

This rhubarb cream cake recipe uses two simple groups of ingredients. For the cake itself — flour, sugar, baking soda, salt, eggs, sour cream, and fresh rhubarb — everything works together to create a soft, tangy crumb.

For the streusel topping — sugar, softened butter, flour, and cinnamon — these four ingredients bake into a golden, crumbly crown.

A quick note: use fresh rhubarb if you can. Frozen works in a pinch, but make sure to thaw and drain it first or your batter will be too wet.

Cake

Amount	Ingredient
2 cups	All-purpose flour
1 ¼ cups	White sugar
1 teaspoon	Baking soda
½ teaspoon	Salt
2 large	Eggs, beaten
1 cup	Sour cream (full fat — yes, the real stuff)
3 cups	Rhubarb, diced (fresh is best!)

Streusel Topping

Amount	Ingredient
1 cup	White sugar
¼ cup	Butter, softened
¼ cup	All-purpose flour
¼ teaspoon	Ground cinnamon (or more — I always go a little heavy here)

Tools You’ll Actually Use

• 9×13-inch baking dish (glass or metal both work)
• Large mixing bowl
• Medium mixing bowl (for the streusel)
• Rubber spatula or wooden spoon
• Cutting board and sharp knife (for dicing rhubarb)
• Toothpick or cake tester
• Measuring cups and spoons

How to Make Oma’s Rhubarb Cake: Step-by-Step Instructions

Ready to make Oma’s Rhubarb Cake? Let’s do this. It’s straightforward and honestly kind of therapeutic.

Step 1: Gather and Prep Your Ingredients

Collect all your ingredients before you start — flour, sugar, baking soda, salt, 2 beaten eggs, 1 cup of sour cream, and 3 cups of diced fresh rhubarb for the cake. For the streusel, have your sugar, softened butter, flour, and cinnamon ready to go.

Step 2: Preheat the Oven and Prep the Pan

Preheat your oven to 350 degrees F (175 degrees C). Grease and flour your 9×13-inch baking dish thoroughly — get into the corners so nothing sticks.

Step 3: Mix the Dry Cake Ingredients

In a large bowl, stir together 2 cups all-purpose flour, 1 ¼ cups white sugar, 1 teaspoon baking soda, and ½ teaspoon salt until evenly combined. No lumps hiding in the corners, please.

Step 4: Add the Wet Ingredients

Stir 2 beaten eggs and 1 cup sour cream into the flour mixture until the batter is completely smooth. It’ll look thick and creamy — that’s perfect. Then gently fold in the 3 cups of diced rhubarb until evenly distributed throughout the batter.

Step 5: Pour Into the Pan

Pour the rhubarb batter into your prepared 9×13-inch baking dish and use your spatula to spread it out into an even layer, right to the edges.

Step 6: Make the Streusel Topping

In a medium bowl, stir together 1 cup white sugar and ¼ cup softened butter until the mixture is smooth and creamy. Then stir in ¼ cup all-purpose flour until the mixture becomes crumbly and clumpy — that’s exactly what you want.

Step 7: Top the Cake

Sprinkle the streusel mixture evenly over the top of the cake batter, covering it from edge to edge. Then dust the top lightly with ground cinnamon — don’t be shy, it makes it smell incredible while baking.

Step 8: Bake to Golden Perfection

Bake the cake in your preheated 350 degree F oven for about 45 minutes. The cake is done when a toothpick inserted into the center comes out clean and the streusel top is golden brown. Your kitchen will smell absolutely amazing at this point.

Step 9: Serve and Enjoy

Let the cake cool in the pan for at least 10 minutes before cutting. Slice into squares and serve warm or at room temperature. Honestly? Both are great.

Claire’s Pro Tips for a Perfect Rhubarb Recipes Cake

Getting this rhubarb recipes cake right is mostly about a few small details that make a big difference. Here are the things I’ve learned after making this more times than I can count.

Don’t skip these — the difference between a good cake and a great one is usually hiding in the tips section.

Dice your rhubarb small. Aim for pieces around ½ inch. Larger chunks tend to hold too much moisture and can make pockets in the cake that stay wet. Smaller dice integrates more evenly into every bite.

Use full-fat sour cream. Low-fat versions have more water content, which can affect the texture of the crumb. Full-fat sour cream gives you that rich, tender result every time.

Don’t overmix the batter. Once you add the wet ingredients to the dry, stir until just combined. Overmixing develops too much gluten and can make the cake tough instead of tender.

Test for doneness at 40 minutes. Every oven runs a little differently. Start checking with your toothpick at the 40-minute mark so you don’t accidentally overbake it. You want the center just set, not dry.

Quick Fixes for Oma’s Rhubarb Cake: Troubleshooting Guide

My cake is too wet in the center

This is usually a frozen rhubarb issue — if you used frozen rhubarb, it releases a lot of extra liquid as it bakes. Next time, thaw and drain frozen rhubarb thoroughly before using. You can also bake the cake 5-10 minutes longer and tent the top with foil to prevent the streusel from burning.

My streusel sank into the batter

This happens when the batter is too thin or the streusel pieces are too large. Make sure your batter is thick before spreading it in the pan. If your streusel looks clumpy-wet rather than crumbly-dry, pop it in the freezer for 5 minutes before sprinkling — it’ll hold its shape much better on top.

The cake is dry

Overbaking is almost always the culprit here. Make sure you’re checking at the 40-minute mark and pulling it out as soon as the toothpick comes out clean. Also double-check that you’re using the correct amount of sour cream — it’s what keeps this cake so moist.

The rhubarb flavor is barely there

You may have used rhubarb that was past its prime. Fresh, in-season rhubarb has much more assertive tartness. If your rhubarb stalks are very green rather than pink or red, they tend to be milder. Make sure you’re using the full 3 cups — don’t underfill!

My streusel isn’t golden after 45 minutes

Your oven may run slightly cool. Turn on the broiler for 1-2 minutes at the very end and watch it like a hawk. The streusel will go from pale to golden quite quickly under the broiler, so don’t walk away.

Variations and Fun Twists on This Rhubarb Coffee Cake

Once you’ve nailed this how-to-make-rhubarb-coffee-cake base, the variations are endless and honestly, really fun to play with.

Strawberry Rhubarb version: Swap 1 cup of the diced rhubarb for 1 cup of fresh sliced strawberries. It’s a classic pairing and makes this cake feel even more summery.

Add a vanilla glaze: Mix 1 cup powdered sugar with 1-2 tablespoons of milk and a splash of vanilla extract. Drizzle it over the cooled cake for a bakery-style finish.

Gluten-free swap: Substitute a 1:1 gluten-free baking flour blend for the all-purpose flour. The texture will be slightly more delicate but still delicious.

Nutty streusel: Add ¼ cup of chopped pecans or walnuts to the streusel mixture before sprinkling. It adds a gorgeous crunch and earthy depth.

Brown sugar streusel: Replace half the white sugar in the streusel with brown sugar for a deeper, almost caramel-like topping flavor.

Make it a loaf: Divide the batter between two greased 9×5 loaf pans and bake for 50-55 minutes. Perfect for gifting to neighbors during rhubarb season.

Serving, Storage, and Reheating

This cake is genuinely lovely warm from the oven, cut into big squares and served with a scoop of vanilla ice cream or a dollop of whipped cream. It also makes a fantastic breakfast cake the next day with your morning coffee — no judgment here, we’ve all been there.

Store leftover cake covered tightly with plastic wrap or in an airtight container at room temperature for up to 2 days. For longer storage, refrigerate for up to 5 days. The sour cream base keeps it moist even after a few days in the fridge, which I love about it.

To reheat, place individual slices in the microwave for 20-25 seconds until just warmed through. If you want to revive the streusel’s crunch, pop a slice in the oven at 300 degrees F for 8-10 minutes — it comes back beautifully.

No-Waste Kitchen Magic: Sustainability Tips

Got extra rhubarb stalks? Don’t toss them! Dice any leftover rhubarb and freeze it flat on a baking sheet, then transfer to a zip-lock bag. It’ll keep in the freezer for up to 6 months and works great in smoothies, oatmeal, or future batches of this cake.

If your cake is looking a little dry on day three, crumble it over a bowl of vanilla yogurt. It’s basically a deconstructed dessert at that point, and honestly it slaps.

The rhubarb leaves, while not edible (they’re toxic — skip them entirely!), are great for composting. Just keep them out of the kitchen entirely.

Love reducing food waste? You might also enjoy this easy one-pot taco pasta — another great way to use pantry staples without anything going to waste.

Frequently Asked Questions

If you love easy crowd-pleasing recipes, you might also want to check out these graduation party mac and cheese bites — they disappear just as fast at any gathering.

Cozy Closing

I’d love to see your spin on Oma’s Rhubarb Cake! Drop a comment below with your photos — I’d genuinely love to see how you made it your own.

Did you add strawberries? Go heavy on the cinnamon? Try it with a vanilla glaze? This Oma’s Rhubarb Cake is so versatile, I bet you’ve already got amazing variations running through your head.

However you bake it, I hope it fills your kitchen with that warm, buttery, cinnamon-rhubarb smell that makes everyone wander in asking “what are you making?” That’s the best part, honestly.

Happy baking, friends. You’ve got this.

I’m Claire Whitmore — a dessert daydreamer from Asheville, NC. For me, baking isn’t about perfect pastries — it’s about the joy of sharing something sweet (and maybe sneaking an extra square before anyone else gets to the pan).