I need you to brace yourself for these. I made these Lemon Poppy Seed Blondies last week and I haven’t stopped thinking about them. I’m not exaggerating when I say they are exactly what I want in a blondie: dense, chewy, and bursting with flavour. Forget everything you thought you knew about lemon bars, because these are in a league of their own!!
These blondies are soft in the middle, with that slightly crinkly top! The combination of bright, zesty lemon with the deep, nutty browned butter is just… everything. It’s a pairing I didn’t fully appreciate until these came out of the oven, and now I’m completely obsessed.
What Makes These Lemon Poppy Seed Blondies So Good
So, how do we get that truly fudgy, chewy blondie texture that still manages to taste bright and fresh? It’s all in a few key choices I made with the ingredients.
- The browned butter: Browning the butter removes some of its water content, which concentrates the fat and gives you this incredibly rich, nutty flavour. That deep, caramel-like note plays so well with lemon.
- The fudgy factor: I’m using a specific ratio of butter to flour, about 1:1.4 by weight, which is the sweet spot for a dense, chewy blondie. Plus, an extra egg yolk means more richness and helps all the ingredients come together smoothly, especially with lemon juice involved (lemon juice can sometimes make things look a little separated, but the yolk helps everything integrate properly).
- Just the right lift: Blondies should be chewy, not fluffy cakes. So, I use a very small amount of baking powder. It gives just enough rise to keep them from being too solid, but definitely not airy.
- Poppy seeds (of course!): Beyond their visual appeal, poppy seeds add a subtle textural contrast and another layer of nuttiness that mixes so well with the lemon and browned butter. 🙂
Ingredients
- Unsalted butter
- Granulated sugar
- Light brown sugar
- Large eggs
- Large egg yolk
- Fresh lemon juice
- Lemon zest
- Pure vanilla extract
- Fine sea salt
- All-purpose flour
- Baking powder
- Poppy seeds
- Powdered sugar
- Whole milk
*These are the main ingredients. The full list of ingredients and measurements can be found at the bottom of this post!*
Equipment
- Kitchen scale (I like to weigh out most of my ingredients for accuracy, I also think it’s more efficient when measuring things out over measuring cups!)
- Large and small mixing bowls
- Measuring cups and spoons
- Whisk
- Rubber spatula
- 8×8 inch metal baking pan
- Parchment paper
- Wire cooling rack
How to Make Your Lemon Poppy Seed Blondies
The process for these blondies is straightforward, I promise!
First, brown the butter in a saucepan. Watch it closely, swirl it, and wait for those golden-brown bits at the bottom. Those bits are where the flavour lives, so scrape them all into your mixing bowl! Let the butter cool for just a few minutes.
Then, whisk in both sugars until the mixture lightens a bit. This step is important because the residual warmth from the butter helps the sugar dissolve properly, leading to a smoother texture later.
Next come the eggs and the extra egg yolk, one at a time, whisking until everything is glossy. After that, add the lemon juice, lemon zest, vanilla, and salt. Don’t worry if the batter looks a little bit separated at this point from the lemon juice, it’ll come back together.
Finally, sift your flour and baking powder over the bowl, then gently fold it in. As soon as you see a few streaks of flour left, add your poppy seeds and fold just until everything is combined. The golden rule of blondies (and brownies!) is: do not overmix. Overmixing develops too much gluten, and you’ll end up with a tough blondie, and we want chewy and fudgy.
Pour it into your prepared pan, bake it!
You’re looking for edges that have started to pull away slightly from the sides of the pan. When you insert a toothpick into the centre, it should come out with a few moist crumbs clinging to it, but not wet batter. Crucially, it should not come out clean. A clean toothpick means an overbaked, dry blondie, and we don’t want that for our fudgy lemon poppy seed bars!!
Tips for Lemon Poppy Seed Blondies
Don’t skip browning the butter
This step is so fundamental to the flavour of these blondies. Take the time to get those golden-brown bits.
Use room temperature eggs
This really does make a difference in the texture and consistency of your batter. Don’t rush this part.
Measure your flour accurately
Too much flour can make your blondies dry. I always recommend using a kitchen scale for accuracy if you have one.
Avoid overmixing the batter
Once you add the flour, fold it in gently and stop as soon as it’s just combined. A few streaks of flour are okay before adding the poppy seeds, then fold just until no dry spots remain.
Don’t overbake
Keep an eye on the oven and pull them out when the edges are set but the centre still looks a little soft. They will continue to set as they cool.
I hope you get a chance to make these soon! If you do, please let me know what you think and tag @theflournook on socials. And if you want to save this lemon poppy seed blondies recipe for later, you can use the button on the recipe card, the buttons around the post, or any of the photos here.
Happy baking!
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Lemon Poppy Seed Blondies
- Total Time: 45 minutes
- Yield: 16 bars 1x
Description
Fudgy, chewy lemon poppy seed blondies with nutty browned butter, bright lemon zest, and a delicious subtle crunch from poppy seeds. These dense bars are topped with a delicious icing lemon glaze that develops even more flavour overnight!
Ingredients
For Blondies
- 1/2 cup (113g) unsalted butter
- 3/4 cup (150g) granulated sugar
- 1/4 cup (55g) light brown sugar, packed
- 2 large eggs, room temp
- 1 large egg yolk, room temp
- 2 tablespoons (30ml) fresh lemon juice
- 2 tablespoons (12g) lemon zest (about 2 large lemons)
- 1 1/2 teaspoons (7ml) pure vanilla extract
- 1/2 teaspoon (3g) fine sea salt
- 1 1/4 cups (160g) all-purpose flour
- 1/4 teaspoon (1g) baking powder
- 2 tablespoons (18g) poppy seeds
For Glaze
- 1 cup (120g) powdered sugar
- 2 tablespoons (30ml) fresh lemon juice
- 1 tablespoon (15ml) whole milk
- pinch fine sea salt
Instructions
- Preheat your oven to 350°F (175°C). Line an 8×8-inch metal baking pan with parchment paper, leaving a 2-inch overhang on two opposite sides for easy lifting later.
- Brown the butter: Place the butter in saucepan over medium heat. Swirl the pan occasionally as the butter melts, foams, and eventually develops golden-brown milk solids at the bottom. This takes about 5-7 minutes. Immediately pour the browned butter into a large heatproof mixing bowl (scrape in all those brown bits!) and let it cool for 5 minutes.
- Add both sugars to the warm browned butter and whisk vigorously for about 1 minute until the mixture looks slightly lighter and a bit fluffy. The residual heat will help dissolve the sugar.
- Add the eggs and egg yolk one at a time, whisking well after each addition until the batter is smooth and glossy.
- Whisk in the lemon juice, lemon zest, vanilla, and salt. The batter might look slightly separated from the lemon juice!
- Sift the flour and baking powder together directly over the bowl, then gently fold in. When a few streaks of flour remain, add the poppy seeds and fold just until everything is evenly combined. Don’t overmix!
- Pour the batter into your prepared pan and spread it evenly into the corners. Bake for 25 minutes. A toothpick inserted in the center should come out with a few moist crumbs, not wet batter, but definitely not clean. The edges will pull away slightly from the pan.
- Let the blondies cool in the pan on a wire rack for at least 30 minutes before glazing.
- Make the glaze: Whisk together the powdered sugar, lemon juice, milk, and salt in a small bowl until completely smooth. The glaze should be thick but pourable (add a tiny splash more milk if it’s too thick, or a bit more powdered sugar if too thin).
- Pour the glaze over the cooled blondies, using an offset spatula or the back of a spoon to spread it evenly to the edges. Let the glaze set for 15-20 minutes before using the parchment overhang to lift the whole block out of the pan. Cut into 16 squares with a sharp knife, wiping it clean between cuts for neat edges.
Notes
- These blondies actually taste better the next day once the flavours have married. The lemon softens slightly and the browned butter notes come forward. Store them in an airtight container at room temperature for up to 4 days, or freeze (unglazed) for up to 3 months.
- Room temperature eggs are crucial here because they emulsify better with the warm browned butter. If you forgot to take them out, place them in a bowl of warm (not hot) water for 5 minutes before cracking.
- Prep Time: 20 mins
- Cook Time: 25 mins
- Category: Blondies
- Method: Baking
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