Strawberry Rhubarb Blondies

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Easy Strawberry Rhubarb Blondies make use of all those fresh strawberries and rhubarb! The easy cookie bars are sweet, buttery and tangy. Perfect for summer picnics.

We love strawberry crisp and can’t get enough of our buttery rhubarb crumb cake, but how often do you often bake with strawberry and rhubarb together? We don’t do it enough.

And that’s changing with these strawberry rhubarb blondies.

pile of strawberry rhubarb blondies

How do I use rhubarb?

Do you have an abundance of rhubarb from your garden? It can be tricky to know what to do with it all.

Rhubarb pairs beautifully with strawberries. Jams, cobblers and breads are popular when working with strawberries and rhubarb.

In the past when we’ve had strawberry and rhubarb, we’ve made strawberry rhubarb pie (or this giant poptart-like slab pie). But we wanted to switch things up a bit. We’re famous for our cookies, so why not some cookie bars…AKA strawberry rhubarb blondies?

What does strawberry rhubarb taste like?

Raw rhubarb has quite a tart flavor. People often compare it to the flavor of green apples. But when you pair rhubarb with strawberries (and sugar found in desserts), you get a wonderfully sweet & tangy treat.

Why are blondies called blondies?

Blondies are very similar to brownies in shape and texture. However blondies are not “brown” because they don’t have chocolate in them. Blondies get their flavor from brown sugar and butter, which gives them a buttery rich molasses flavor.

Blondies are considered “blond”, giving them their name! They are very similar to other cookie bars, so that is another name that you’ll often hear them called.

How to Make Strawberry Rhubarb Blondies

Here are a few tips when making blondies:

  • Use melted butter. This not only helps with texture, but also makes mixing the batter very easy. No power mixer necessary.
  • Use brown sugar. Packed brown sugar to be exact. And if you really want to add deep molasses flavor, use dark brown sugar instead of light brown.
  • We used unsalted butter for this recipe. If you use salted butter, reduce the salt you add to ¾ teaspoon at most.
  • All of our recipes call for large eggs. If a recipe doesn’t specify what size eggs to use, you can assume it is large. **Pro Tip: If eggs are at room temperature, they mix in much better than cold eggs.**
  • Dice the strawberries and the rhubarb finely so that they bake in well. You can remove the strings from the rhubarb if you’d like but you don’t have to.
  • Press the batter into a 9×13 baking pan. Make sure you spray the baking pan with cooking spray. If you’d like the bars to come out perfectly clean and easily cut them into nice squares, line the pan with parchment paper before adding the dough. 
  • Bake the blondies for about 27-30 minutes. You want the edges to be ever so slightly browned, but if you want the bars to be soft, don’t over bake them.

Can I use frozen strawberries in place of fresh strawberries?

Yes! If you choose this, I recommend buying frozen whole strawberries. Thaw the strawberries and strain off any extra liquid. Then dice the strawberries as if they were fresh.

rhubarb strawberry blondies sitting on a table

Can you freeze blondies?

In general you can freeze blondies. Because these blondies have fresh fruit on top, they will be trickier to freeze. When you defrost them, the fruit can become mushy. For that reason, we do not recommend freezing blondies with fresh fruit.

How do you store desserts with fruit?

When you have prepared a dessert with fresh fruit, it is best to store them in an airtight container in the refrigerator. This will help the bars to stay fresher longer.

cut strawberry blondie bars with white chocolate
cut strawberry blondie bars with white chocolate

Strawberry Rhubarb Blondies

4.85 from 20 votes
Easy Strawberry Rhubarb Blondies make use of all those fresh strawberries and rhubarb! The easy cookie bars are sweet, buttery and tangy. Perfect for summer picnics.
Servings 15
Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes

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  • Preheat oven to 350 degrees. Spray a 9×13 baking pan with cooking spray or line the pan with parchment paper.
  • In a large bowl, whisk together melted butter and sugars.
  • Add eggs and vanilla extract and whisk until smooth.
  • Add flour, baking powder, and salt to the butter mixture and stir with a wooden spoon until combined. Batter will be thick.
  • Mix in ¾ cup of diced strawberries and ¾ cup sliced rhubarb.
  • Pour batter into the prepared pan and spread evenly.
  • Sprinkle top with remaining strawberries and rhubarb.
  • Bake blondies for 30-35 minutes or until a knife is inserted and comes out clean.
  • Cool completely. You can drizzle the top of the bars with melted white chocolate if you'd like.


*Sometimes we add chopped white chocolate into the blondies. About 5 ounces of chopped white chocolate would be a good amount.
The calories shown are based on the recipe being cut into 15 pieces, with 1 serving being 1 blondie bar. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information.**


Calories: 379kcal | Carbohydrates: 59g | Protein: 5g | Fat: 14g | Saturated Fat: 8g | Cholesterol: 62mg | Sodium: 147mg | Potassium: 137mg | Fiber: 1g | Sugar: 28g | Vitamin A: 445IU | Vitamin C: 6.3mg | Calcium: 46mg | Iron: 2.2mg
Course Dessert
Cuisine American
Calories 379
Keyword blondie bars, cookie bars, dessert with fresh fruit, how to make blondies, strawberry rhubarb dessert

Other Blondie Bars Recipes

About Julie Clark

I'm Julie Clark, CEO and recipe developer of Tastes of Lizzy T. With my B.A. in Education and over 30 years of cooking and baking, I want to teach YOU the best of our family recipes.

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1 year ago

5 stars
Loved this recipe! I made it with only rhubarb, no other fruit, and it was perfect. I added a bit of white chocolate, but it would’ve been good without too. Great recipe!

1 year ago

5 stars
Made half in 9x 9. used frozen blueberries and fresh rhubarb. 35 minutes in foil 9 x 9. Yummy!

1 year ago

It was very hard to get into the 9×13 pan. Very thick and sticky. It barely covered the base of the pan and I had to move it around with my fingers

2 years ago

Can you make these dairy-free using coconut oil or vegan/olive oil based butter instead of real butter?

Rebecca Knapp
2 years ago

5 stars
My bars are taking at least 45 minutes to bake and could go a little longer but the edges are starting to get too brown. Am I doing something wrong? I am using a glass dish, would that change anything?

3 years ago

Hi! Can you make this recipe with cherries instead of strawberries? And how big should the rhubarb slices be?

Alma Vorrei
4 years ago

I’m going to attempt to make these blondies for my hubby on Saturday! They look amazing!