Easy Moist Rhubarb Cake Recipe Ready in 45 Minutes

If you’ve got rhubarb sitting on your counter and no idea what to do with it, this easy moist rhubarb cake recipe is exactly what you need. I make this one constantly for my family, and it disappears fast every single time.

I’m Emily, and as a busy mom of two, I need desserts that don’t require a whole afternoon in the kitchen. This cake comes together in just 15 minutes of prep. You probably already have everything in your pantry right now.

The crumb is incredibly tender, and that crispy cinnamon streusel topping takes it completely over the top. The tangy rhubarb cuts through the sweetness in the best way. Start to finish, you’re done in under an hour.

Table of Contents

Table of Contents

Why You’ll Love This Easy Moist Rhubarb Cake Recipe

Honestly, this cake checks every box. Here’s why it keeps showing up in my kitchen:

• Prep takes just 15 minutes, so you’re not stuck in the kitchen all day.
• Simple pantry ingredients you likely already have on hand.
• Kids and adults both go back for seconds, every single time.
• Works with fresh or frozen rhubarb, so you can make it year-round.
• That crispy cinnamon streusel topping is absolutely irresistible.
• The crumb stays wonderfully tender and moist.
• One pan feeds 12 people, which is perfect for family gatherings.

Ingredients for Easy Moist Rhubarb Cake Recipe

Good news – nothing fancy here. Let me break everything down so you can grab it all before you start.

For the cake batter, you’ll need:

• 2 cups all-purpose flour
• 1 1/4 cups white sugar
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 2 large eggs, beaten
• 1 cup full-fat sour cream
• 3 cups rhubarb, diced into small even pieces

For the streusel topping, you’ll need:

• 1 cup white sugar
• 1/4 cup butter, softened at room temperature
• 1/4 cup all-purpose flour
• 1/4 teaspoon ground cinnamon, or a little more if you love that warm spice flavor

Ingredient Notes and Substitutions

A few things I want you to know before you dive in:

• Sour cream is what keeps this cake so incredibly moist and tender. Don’t skip it. If you don’t have any on hand, full-fat Greek yogurt works as a direct swap, same amount, no other changes needed.
• Fresh rhubarb is my first choice, but frozen works perfectly fine too. Just make sure you thaw it completely and drain off any extra liquid before folding it into the batter. Extra moisture will throw off the texture.
• Cut your rhubarb into small, even pieces. This helps it spread throughout the whole cake so every single bite gets that gorgeous tangy flavor instead of it all clumping in one spot.

How to Make Easy Moist Rhubarb Cake Recipe

This comes together so easily. Just follow these steps and you’ll have a beautiful cake ready in no time.

1. Gather all your ingredients and set them out on the counter. Preheat your oven to 350 degrees F. Grease and flour a 9×13-inch baking dish and set it aside.
2. In a large bowl, stir together the 2 cups of flour, 1 1/4 cups sugar, baking soda, and salt. Give it a good mix so everything is evenly combined.
3. Add the beaten eggs and sour cream to the dry ingredients. Stir until the batter is smooth. Stop mixing as soon as it comes together. Overmixing here is the number one thing that makes a cake tough instead of tender, so be gentle.
4. Fold in the diced rhubarb. A few slow stirs with a spatula is all you need.
5. Pour the batter into your prepared baking dish and spread it out evenly all the way to the edges.
6. Now make the streusel. In a separate bowl, stir together 1 cup sugar and the softened butter until smooth. Add the 1/4 cup flour and stir until the mixture looks crumbly and clumpy, kind of like wet sand that’s starting to clump together. That’s exactly what you want.
7. Sprinkle the streusel evenly over the top of the batter. Then dust the whole thing lightly with ground cinnamon.
8. Bake for about 45 minutes. At the 45-minute mark, insert a toothpick into the center of the cake. If it comes out clean, you’re done. If there’s wet batter on it, give it another 5 minutes and check again.
9. Pull the cake out of the oven and let it cool for at least 10 to 15 minutes before you slice into it. I know it’s hard to wait, but it really does cut so much cleaner once it’s had a chance to settle.

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Tips for a Perfect Easy Moist Rhubarb Cake Recipe

A few little things make a big difference here. Keep these in mind and your cake will turn out great every time.

• Do not overmix the batter once the eggs and sour cream go in. Stir just until smooth and stop right there.
• Cut your rhubarb into small, even pieces so it spreads through the whole cake instead of sinking to one area.
• Make sure your butter for the streusel is softened, not melted. Melted butter will make the topping wet and flat instead of crumbly and crispy.
• Check doneness with a toothpick right at the 45-minute mark. Every oven runs a little differently, so don’t just set a timer and walk away.
• Let the cake cool slightly before cutting. You’ll get much cleaner, prettier slices that way.

Serving Suggestions for Easy Moist Rhubarb Cake Recipe

This cake is honestly wonderful on its own, but a few simple additions make it extra special. Here are my favorite ways to serve it:

• A scoop of vanilla ice cream on top is absolutely dreamy while the cake is still slightly warm.
• A big dollop of whipped cream keeps things light and simple.
• A dusting of powdered sugar if you want something quick and pretty.
• Serve it as a dessert after dinner and watch it disappear.
• It’s also perfect alongside your afternoon coffee or tea.

Storage and Reheating for Easy Moist Rhubarb Cake Recipe

Good news – this cake keeps really well. Here’s exactly how to store it:

• Room temperature: Cover the pan tightly with plastic wrap or foil and it’ll stay fresh for up to 2 days.
• Refrigerator: Pop it in an airtight container and it’ll keep for up to 5 days. I actually love it cold straight from the fridge.
• Freezer: Wrap individual slices tightly in plastic wrap, then foil, and freeze for up to 2 months. So handy for those days when you just need a little something sweet.

To reheat, just microwave a slice for 20 to 30 seconds and it tastes almost fresh-baked again. If your slice is frozen, let it thaw on the counter for an hour or so before serving or warming it up.

Nutritional Information

Here’s a rough breakdown per slice, based on 12 servings from one pan. Keep in mind these are estimates, and your actual numbers may vary a little depending on the specific ingredients and brands you use.

• Calories: 320 kcal
• Carbohydrates: 58g
• Sugar: 38g
• Protein: 4g
• Fat: 8g
• Saturated Fat: 4.5g
• Unsaturated Fat: 3g
• Trans Fat: 0g
• Fiber: 1g
• Sodium: 210mg
• Cholesterol: 50mg

Frequently Asked Questions About Easy Moist Rhubarb Cake Recipe

Can you use frozen rhubarb in this easy moist rhubarb cake recipe?
Yes, absolutely. Frozen rhubarb works great in this simple rhubarb dessert. Just thaw it completely first and drain off any extra liquid before folding it into the batter. Skipping that step adds too much moisture and throws off the texture.

What can I substitute for sour cream?
Full-fat Greek yogurt is the best swap. Use the exact same amount and you won’t notice a difference. It keeps the sour cream rhubarb cake just as tender and moist.

How do you know when the cake is done baking?
Stick a toothpick into the center at the 45-minute mark. If it comes out clean, your rhubarb streusel cake is ready. Wet batter means it needs a few more minutes.

Can you make this easy moist rhubarb cake recipe ahead of time?
Yes, and it actually tastes wonderful the next day. Bake it the night before, cover it tightly, and store it at room temperature or in the fridge. If you are looking for other great recipes, check out what we have on Facebook.

How do you keep the cake moist after baking?
Cover it well. Wrap the pan tightly with plastic wrap or store slices in an airtight container. The sour cream in the batter does most of the work keeping it soft and moist for days.

Share Your Easy Moist Rhubarb Cake Recipe Results

I’d love to hear how yours turned out! Drop a comment below and tell me everything. Did the streusel get perfectly crispy? Did your family go back for seconds? Leave a rating too, it really helps other home bakers find this recipe. If you are looking for more rhubarb inspiration, check out this old fashioned rhubarb cobbler recipe.

And if you snapped a photo, share it on social media and tag Frosty Recipes. Seeing your bakes genuinely makes my day. For more dessert ideas, you might enjoy this classic fresh rhubarb pie recipe.

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