Blondies are bar cookies built on brown sugar and butter rather than chocolate, which gives them a dense, chewy texture and a caramel-forward flavor that stands on its own. This recipe uses a full cup of butter and a combination of brown and granulated sugar, producing 12 bars in about 40 minutes with minimal cleanup. They’re one of the most reliable things you can bake ahead for a crowd — they actually improve after a day of rest.
About the ingredients
- Brown sugar: Dark brown sugar has more molasses than light, so it produces a deeper, slightly more complex flavor and a marginally stickier crumb. Either works — use what you have, but know the difference is noticeable.
- Butter: The recipe calls for melted butter, not softened. Melted butter is what creates the dense, fudgy chew rather than a cakey texture. Let it cool for a few minutes before mixing so it doesn’t scramble the eggs.
- Walnuts: Toasting them in a dry pan for 4–5 minutes before folding them in sharpens their flavor considerably. Skip this step and they taste flat against the sweet batter.
- Vanilla bean paste (from the notes): A direct swap for extract at the same volume. It adds visible specks and a slightly fuller flavor, but plain extract produces a perfectly good blondie — don’t buy paste just for this recipe.
Before you start
The two things that most affect the final texture are how you mix and when you pull them from the oven. Once you add the flour, mix only until the streaks disappear — overworking the batter develops gluten and turns the bars tough instead of chewy. On timing: the toothpick test is your guide, but the center will look slightly underdone and the edges will just be pulling away from the pan. That’s correct. The bars firm up as they cool, and cutting them too early — even 10 minutes out of the oven — gives you crumbly, unclean slices. Full cooling in the pan is not optional if you want neat bars.
Troubleshooting
- Bars are greasy or oily on top: The butter was too hot when mixed with the sugars. Next time, let melted butter cool until it’s just warm to the touch before whisking it in.
- Bars came out cakey instead of chewy: Too much flour, or the flour wasn’t measured correctly. Spoon flour into the measuring cup and level it off — don’t scoop directly from the bag, which compacts it.
- Bars are dry and crumbly: They were overbaked. An 8×8 pan runs hot in many ovens; start checking at 22 minutes and pull them the moment the center no longer jiggles.
- Mix-ins sank to the bottom: The batter was too warm when you folded them in, or the pieces were too heavy. Toss chocolate chips or nuts in a teaspoon of the measured flour before folding — it helps them stay suspended.
- Top is shiny and cracked but inside is gummy: This is usually under-baking combined with cutting too soon. Let them cool completely in the pan, then refrigerate for 30 minutes before slicing if the center still seems soft.
Storage and freezing
Stored in an airtight container at room temperature, these blondies stay moist and chewy for up to 4 days — skip the powdered-sugar glaze if you’re storing them stacked, since it gets tacky. For longer storage, wrap the entire uncut slab tightly in plastic wrap and then foil; it freezes well for up to 2 months. Thaw overnight at room temperature still wrapped, then slice once fully thawed. If you’re baking for an event, the uncut slab actually tastes better on day two than day one, so baking the night before is genuinely the right call, not just a convenience.
Classic Blondies
Equipment
- 8x8-inch baking pan
- Mixing Bowls
- Whisk
- Rubber spatula
- Oven
Ingredients
- 1 cup unsalted butter melted and slightly cooled
- 1 cup brown sugar packed; for a deeper flavor, use dark brown sugar
- ½ cup granulated sugar
- 2 large eggs preferably organic
- 2 teaspoons vanilla extract pure
- ½ teaspoon baking powder
- ¼ teaspoon baking soda
- ½ teaspoon salt sea salt preferred
- 1 ½ cups all-purpose flour sifted for a lighter texture
- 1 cup chopped walnuts optional, can substitute with chocolate chips or leave out for a nut-free version
Instructions
- Preheat your oven to 350°F (175°C). Grease an 8x8 inch baking pan or line with parchment paper for easier removal.
- In a medium mixing bowl, whisk together the melted butter, brown sugar, and granulated sugar until smooth and creamy.
- Add the eggs, one at a time, beating well after each addition. Stir in the vanilla extract.
- In a separate bowl, combine the baking powder, baking soda, salt, and flour. Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
- Fold in the walnuts or your preferred mix-ins, ensuring they are evenly distributed throughout the batter.
- Pour the blondie batter into the prepared baking pan, spreading it evenly with a rubber spatula.
- Bake for 25 minutes or until the blondies are lightly golden on the edges and a toothpick inserted into the center comes out clean. Do not overbake, as this will alter the chewy texture.
- Allow to cool in the pan before slicing into bars. Serve them warm or at room temperature.
Notes
- For a richer vanilla flavor, use a vanilla bean paste instead of vanilla extract.
- If desired, drizzle with a simple glaze made of powdered sugar and milk for added sweetness.
Nutrition
Frequently asked questions
Can I double this recipe and bake it in a 9×13 pan?
Yes, a doubled batch fits a 9×13 pan well. Increase the bake time to roughly 30–35 minutes and start checking early, since the thicker batter takes longer to set in the center.
Do I have to use both brown sugar and granulated sugar, or can I use all brown sugar?
You can use all brown sugar, but the bars will be slightly denser and stickier. The granulated sugar lightens the crumb just enough to keep the texture from being too heavy — the split is worth keeping if you have both on hand.
My blondies always come out flat and dense without any lift. What’s going wrong?
Check that your baking powder and baking soda are fresh — both lose potency after about 6 months once opened. Drop a pinch of baking soda into hot water; if it doesn’t bubble immediately, replace it.
What to bake next
- Elevated Brown Butter Rice Krispie Treats
- Mediterranean Sunshine Lemon Crumble Bars
- Nutty Brown Butter Vanilla Bean Cupcakes
- Espresso Walnut Biscotti