If you love fruity desserts with a mix of chewy, fudgy texture and vibrant citrus zing, these lemon blueberry blondies are a must-bake. Packed with juicy blueberries, a hint of lemon, and topped with buttery streusel crumble, this easy one-bowl blondie recipe delivers big bright flavour with minimal fuss. They’re a cross between lemon blueberry bars and classic fudgy blondies—sweet, tangy, and irresistibly moist.

Whether you’re baking for a summer picnic, afternoon tea, or just craving something bright and buttery, these moist blondies hit all the right notes.

These moist blondies, like soft lemon bars studded with blueberries, are a combination of my blueberry cake and my raspberry chocolate chip blondies. Almond flour is added to a classic blondie batter for added texture (chewy, moist) and flavour. It’s topped withd a crunchy streusel, similar to my coffee cake muffins on top.

This recipe was first published here on September 1st, 2020 and has been updated with new images. It was renamed from lemon blueberry bars to blueberry blondies which just makes more sense.

Top down view of 12 chewy blueberry blondies with lemon glaze.

Ingredients you’ll need

These fudgy blueberry blondies use everyday ingredients plus gorgeous blueberries and lemons. Since you can use frozen blueberries, they can be made any time of year too!

Jump to the recipe for full ingredients and instructions.

  • Flour and almond flour: Both plain flour (all purpose flour) and almond flour make the base of these blondies with the latter adding extra texture and moisture.
  • Sugar: white and brown. The brown sugar adds extra flavour and moisture along with a little of the chewy texture and can be swapped for dark brown sugar if you prefer.
  • Baking powder: Just a touch of baking powder adds a little lift to give this a lovely texture.
  • Eggs: Two eggs, both egg whites and egg yolk, are what bind this all together.
  • Butter: melted for the blondie base to make it easy to mix together and softened butter is used to combine the crumb topping
  • White chocolate: This is added purely to help to achieve that fudgy texture. You can’t taste the white chocolate so, if you aren’t a fan, don’t be concerned. See the Variations section below for a substitute.
  • Blueberries: One of the main two stars in this recipe, I prefer to use fresh blueberries but frozen will work too. If using frozen blueberries, don’t thaw them first. Mix them into the batter still frozen. You can read more about baking with frozen fruit here.
  • Lemon: The other star player in these amazing bars. Both juice and zest are used in the blondie batter and the lemon icing.

Feel free to add a teaspoon vanilla extract too!

Closeup of 3 blueberry blondies, easy summer dessert bars with blueberries, lined up.

How to make blueberry blondies

All 3 components are so easy to make – blondies, streusel topping and lemon icing – no mixer required. The crumble top, adds so much texture – a lovely crunch over that dense and chewy blondie – and the lemon icing is a lovely sweet, tangy lemon touch.

Blondies are the blonde answer to a chocolate brownie with that same fudgy texture but often made using white chocolate or no chocolate at all. And they’re perfect when you want a simple baking recipe.

Jump to the recipe for full ingredients and instructions.

1. The blueberry blondie batter

All mixed in one bowl, start by whisking together the dry ingredients.

The dry ingredients mixed in a bowl.

Add the wet ingredients to a well in the centre then gently stir it all together with a spatula.

The wet and dry ingredients combined in a mixing bowl.

Add half the blueberries and fold them through.

The blueberries mixed through the batter.

2. Make the crumble topping

Scrape out the blondie batter bowl well (a silicone spatula is great for this), then use the same bowl to make the crumble topping.

Just add 3 ingredients to the bowl – butter, sugar, flour – and use clean fingers or a pastry cutter to blend them into a crumbly mixture.

The crumble mixture in a mixing bowl, ready to use.

3. Assemble and bake

Tip the batter into an 8 inch square tin and spread it out, adding a few more blueberries to the top. Scatter the crumble mixture over the top and bake.

Top down view of the batter topped with crumble in a baking pan.

4. Glaze

Mix together the icing ingredients in a bowl, then drizzle it over the cooled blondies.

Lemon icing being drizzled over fudgy lemon blueberry bars with a crumb topping.

Tips and tricks

  • Always use a kitchen scale when measuring things like flour and almond flour (even sugar). In fact, if a recipe shows a weight measurement first, it’s best to weigh it. This will give you the most accurate results. The way you add flour to your measuring cup may vary from the way I do, so weights are always the best way to go.
  • Make sure your eggs are at room temperature before beginning so they blend nicely into the batter.

Variations

Recipes like this blondies recipe are extremely versatile and I’ve used adaptations of this one for many other recipes.

  • Chocolate Chips: White chocolate chips work beautifully in this blueberry blondie recipe. They’re great with blueberries as you can see in these blueberry cookies and the creamy flavour works well with lemon too.
  • Swap the lemon for orange: Another great flavour with blueberries is orange – you can see that combo in these blueberry orange muffins. Swap all the lemon juice and zest for equal quantities of orange juice and zest.
  • Leave the icing off: These blueberry lemon bars are also delicious without the icing, however, if you’re going to skip it, it would be worthwhile adding some extra zest either into the blondie base or the streusel topping.
  • Berries: Skip the blueberries and use any other berry you like. Blackberries and raspberries are two of my favourites to use with lemon. See these lemon raspberry mini bundt cakes. Strawberries work too, though fresh is best so you can cut them into smaller pieces.
  • White chocolate: The white chocolate in the mix is more to add texture to these bars than anything and you can’t taste it but, if you don’t have any or would prefer not to use it, swap it for ¼ cup of yoghurt.
  • Gluten-free: Swap the plain flour for your favourite gluten-free flour blend.

Storage and serving blueberry blondies

  • Fridge: Since these bars contain fresh blueberries, store them in the fridge for up to 4 days in an airtight container. They are best served at room temperature though, so take them out of the fridge at least 30 minutes before serving.
  • Freezer: These bars can be frozen for 2-3 months. Thaw them in the fridge overnight or right on the kitchen worktop for an hour.
  • Reheat: These blueberry lemon bars are lovely served cold, but are best at room temp or even warmed up with a little cream served on the side as a full dessert.
Two chewy blueberry blondies with lemon glaze, stacked, with more surrounding them.

FAQ’s

Can I use frozen blueberries in blondies?

Yes, you can. Keep them frozen – don’t thaw- right up until you add them the blondie batter. Once they thaw, they release a lot of juice which can discolour your batter.

What makes blondies fudgy instead of cakey?

A higher ratio of wet ingredients and a less leavening agents are the main components to making blondies fudgy, rather than cakey. These blueberry blondie bars have white chocolate and almond flour added to assist with the texture too.

Do blueberry blondies need to be refrigerated?

Yes. Since they have fresh fruit, you will need to keep these in the fridge, in an airtight container for up to 4 days.

Can I freeze lemon blueberry blondies?

Yes, you can freeze these for up to 3 months in an airtight container. Make sure to slice them first and they will thaw in an hour or so on the kitchen bench.

Lemon and blueberries truly go so well together, so if you love both, like I do, I promise you’ll love these indulgent and fudgy little blueberry lemon bars.

More recipes you love

Bars are portable and, more often than not, easy to make. I’ve added links to some of my favourites below.

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A stack of 3 blueberry blondies.
5 from 7 ratings
These blueberry blondies are fudgy blondies, bursting with blueberries, topped with crunchy streusel and a tangy, sweet lemon glaze.

Ingredients

FOR THE BASE

  • 1 cup plain flour (all-purp flour) (130g / ~4½oz)
  • ½ cup almond flour (almond meal) (60g)
  • ½ cup granulated white sugar (100g / 3½oz)
  • ½ cup light brown sugar, packed (100g / 3½oz)
  • ¼ teaspoon baking powder
  • ¼ teaspoon salt
  • 2 large eggs lightly beaten
  • 113 g unsalted butter melted, (½ cup / 1 stick)
  • 50 g white chocolate melted, (1.8oz)
  • 1 tablespoon lemon juice (notes)
  • 2 teaspoons (not packed) lemon zest
  • 1 teaspoon vanilla
  • 1 cup fresh blueberries (150g / 5.3oz)

FOR THE STREUSEL

  • 57 g unsalted butter (2oz / ¼ cup / 4 tablespoons)
  • 4 tablespoons white granulated sugar (notes)
  • 65 g plain flour (all-purp flour) (2.3oz / ½ cup)

FOR THE LEMON ICING

  • ½ cup icing sugar (powdered sugar)
  • 2 teaspoons lemon juice

For best results, always weigh ingredients where a weight is provided

Equipment

Instructions
 

  • FOR THE BLONDIE BATTER:
    Preheat your oven to 180C (160C fan forced) / 350F. Line an 8×8 inch square baking tin with baking paper
  • In a large mixing bowl, combine the flour, almond flour, both sugars, baking powder and salt and whisk together until there are no lumps left. Make a well in the centre.
  • Add the eggs, melted butter, melted white chocolate, lemon juice, zest and vanilla and mix with a spatula to combine.
  • Add half of the blueberries and gentle fold only 2-3 times.
  • Pour the batter into the prepared pan and level out with your spatula.
  • Scatter most of the remaining blueberries over the top, reserving just a few for the very end. Gently push some of the blueberries down a little. Set aside.
  • FOR THE STREUSEL:
    Place all streusel ingredients into a medium bowl (or you can use the same one as the batter if you've scraped it out well) and use your fingertips to press it all together until it look like bread crumbs and clumps when you squeeze it together.
  • Scatter over the top of the batter. Don't press it down. Scatter the final blueberries on top.
  • Bake for 45-50 minutes until the edges are turning golden and there is no wobble in he centre.
  • Cool in the tin for at least 45 minutes before removing and cutting into 16 pieces with a sharp knife. The longer it cools the easier it will be to cut.
  • FOR THE LEMON ICING:
    Combine the icing sugar and lemon juice in a small bowl and mix together to a smooth icing.
  • Drizzle over the cooled bars.
  • Please take a moment to leave a comment & rating. It's appreciated and so helpful.

Notes

  1. Tablespoons: I use a standard Australian 20ml tablespoon (equal to 4 teaspoons). Check yours before measuring.
  2. For best results you should always weigh ingredients like flour and sugar. Kitchen scales are relatively cheap but if you can’t weigh the ingredients, use the spoon and level method (don’t scoop).
  3. Nutrition details are approximate only – scroll below the recipe to find the full nutritional information.
MORE BARS AND SLICES
Have you tried this recipe?Don’t forget to leave a rating and comment below and let me know how it was! I love hearing from you. Nutrition information is approximate and derived from an online calculator. The brands you use may cause variations.
Nutrition Facts
Blueberry blondies
Amount Per Serving (66 g)
Calories 331 Calories from Fat 144
% Daily Value*
Fat 16g25%
Saturated Fat 9g56%
Trans Fat 0.5g
Polyunsaturated Fat 1g
Monounsaturated Fat 4g
Cholesterol 62mg21%
Sodium 69mg3%
Potassium 78mg2%
Carbohydrates 44g15%
Fiber 1g4%
Sugar 30g33%
Protein 4g8%
Vitamin A 407IU8%
Vitamin C 3mg4%
Calcium 42mg4%
Iron 1mg6%
* Percent Daily Values are based on a 2000 calorie diet.