These blueberry lemon blondies are sweet and tangy bars that are super easy to make! The juicy blueberries mix perfectly with a zesty lemon flavor for a delicious treat.
I love how they’re chewy and packed with fruity goodness. They make a great snack, and guess what? They disappear faster than you can say “yum!” 🥳
Key Ingredients & Substitutions
Butter: You’ll want unsalted butter for this recipe to control the saltiness. If you’re looking for a dairy-free option, coconut oil or a plant-based butter can be great substitutes!
Brown Sugar: Light brown sugar gives these blondies their delicious flavor and moisture. If you don’t have brown sugar, you can use granulated sugar and add a tablespoon of molasses for a similar taste.
Eggs: They help bind the ingredients together. If you’re vegan or can’t eat eggs, try using flax eggs (1 tablespoon ground flaxseeds mixed with 2.5 tablespoons water per egg) or unsweetened applesauce as a replacement!
Lemon: The zest and juice add brightness. If you’re out of lemons, lime zest and juice can work instead, giving it a fun twist. Just remember to adjust the flavor to your liking!
Blueberries: Fresh blueberries are the star here. If they’re not in season, you can use frozen blueberries, just make sure to fold them in gently when the batter is mixed.
How Do I Ensure My Blondies Are Perfectly Moist?
The key to moist blondies is careful mixing and baking! Avoid overmixing the batter after adding flour—mix just until you don’t see dry flour anymore. Overmixing can lead to dense blondies.
- Preheat your oven correctly to ensure even baking.
- Check for doneness a few minutes before the suggested baking time. A toothpick should come out clean or with just a couple of moist crumbs.
- Let the blondies cool in the pan for a few minutes before transferring them to a wire rack. This helps them set and keep their moisture.

How to Make Blueberry Lemon Blondies
Ingredients You’ll Need:
For the Blondies:
- 1 cup unsalted butter, melted
- 1 1/2 cups light brown sugar, packed
- 2 large eggs
- 2 teaspoons vanilla extract
- 2 cups all-purpose flour
- 1/2 teaspoon baking powder
- 1/4 teaspoon salt
- Zest of 1 lemon
- 1/4 cup fresh lemon juice
- 1 1/2 cups fresh blueberries
For the Glaze:
- 1 cup powdered sugar
- 2-3 tablespoons fresh lemon juice
How Much Time Will You Need?
This delightful recipe will take about 15 minutes for preparation and 30-35 minutes for baking. You will need some additional time for cooling and glazing, so plan for about 1 hour total before you can slice into your delicious blondies!
Step-by-Step Instructions:
1. Prepare Your Oven and Baking Pan:
First things first, preheat your oven to 350°F (175°C). While that’s heating up, take a 9×9 inch baking pan and grease it or line it with parchment paper to make removing the blondies easier later on.
2. Mix the Butter and Sugar:
In a large mixing bowl, pour in the melted butter and the packed light brown sugar. Stir everything together really well until it’s smooth and combined. This is where the sweetness of your blondies begins!
3. Incorporate the Eggs and Vanilla:
Now it’s time to add the eggs! Add them one by one, mixing well after each addition. This helps the batter become nice and creamy. After the eggs are well mixed in, stir in the vanilla extract for that lovely aroma!
4. Combine the Dry Ingredients:
In a separate bowl, whisk together the all-purpose flour, baking powder, and salt. This ensures your dry ingredients are evenly mixed before they meet the wet ingredients.
5. Mix it All Together:
Gradually add your dry ingredients to the wet mixture. Do this in parts, stirring just until everything is combined. Be careful not to overmix, as we want to keep our blondies nice and soft!
6. Add Lemon and Blueberries:
Now for the tasty part! Gently fold in the lemon zest, fresh lemon juice, and juicy blueberries. Take your time—this will prevent the blueberries from breaking apart too much.
7. Ready to Bake:
Pour the batter into your prepared pan and spread it out evenly. This helps with even baking.
8. Bake the Blondies:
Place the baking pan in the preheated oven and bake for 30-35 minutes. To check if they’re done, insert a toothpick into the center—if it comes out clean or with a few moist crumbs, they’re ready!
9. Let Them Cool:
Once baked, remove them from the oven and let them cool in the pan for a bit. While they cool, you can prepare the lemon glaze.
10. Make the Lemon Glaze:
In a small bowl, mix the powdered sugar with enough lemon juice to create a smooth but drizzle-able consistency. Adjust the amount of lemon juice based on how thick or thin you want the glaze to be.
11. Glaze and Serve:
Once the blondies are cool, drizzle the lemon glaze over the top. Cut them into squares and serve! Enjoy your sweet and zesty blueberry lemon blondies!
Can I Use Frozen Blueberries in This Recipe?
Yes, frozen blueberries work well too! Just make sure to add them directly from the freezer to the batter without thawing to avoid excess moisture. Gently fold them in to keep them intact.
How Should I Store Leftover Blondies?
Store any leftover blondies in an airtight container at room temperature for up to 3 days. If you’d like to keep them fresh for longer, refrigerate them for up to a week!
Can I Substitute the Butter with Margarine?
Absolutely! You can replace unsalted butter with an equal amount of margarine. Just ensure it’s melted and at the same consistency as the butter for best results.
What Can I Use Instead of Eggs?
If you’re looking for an egg substitute, try using 1/4 cup unsweetened applesauce per egg. Alternatively, you can mix 1 tablespoon of ground flaxseed and 2.5 tablespoons of water for each egg replacement and let it sit until it thickens.



