Blondies are brown-sugar bars — chewy, buttery, and ready in 45 minutes with ingredients most bakers already have on hand. There’s no chocolate required, which means the flavor comes entirely from caramelized brown sugar and butter, and that combination is genuinely hard to beat. They also travel and keep exceptionally well, which makes them one of the most practical things you can bake.
Smart swaps
- Light brown sugar: This is the standard choice and gives a mild caramel flavor. Dark brown sugar works too and produces a deeper, more molasses-forward bar — both are good, just different.
- Unsalted butter: If you only have salted butter, use it and omit the added salt in the recipe.
- All-purpose flour: No swap needed here — bread flour will make the bars tough, and cake flour will make them too soft to hold their shape when cut.
- Eggs at room temperature: Cold eggs can cause the melted butter to seize slightly. If you forgot to take them out ahead of time, set them in a bowl of warm water for five minutes.
What makes this version work
Two things matter most here. First, whisking the melted butter and brown sugar together thoroughly — not just until combined, but until the mixture looks smooth and slightly glossy — dissolves more of the sugar and gives the finished bars a shinier, crackled top. Second, stopping the mixing as soon as the flour disappears is what keeps the texture chewy rather than tough. Gluten develops fast once flour hits wet ingredients, and even a minute of extra stirring will noticeably change the texture. Use a rubber spatula for the fold and put it down the moment you stop seeing dry streaks.
What can go wrong
- Bars are greasy or oily on the bottom: This usually means the butter was too hot when added. Let melted butter cool for a few minutes before whisking it with the sugar — it should be warm, not steaming.
- Bars are dry and crumbly: They were overbaked. A toothpick coming out completely clean can actually mean you’ve gone a minute or two too far. Pull them when the toothpick has just a few moist crumbs clinging to it.
- Bars are impossible to cut cleanly: They weren’t fully cooled. Blondies need to set as they cool — cutting warm bars will give you a gummy, ragged edge. Cool completely in the pan before slicing, and use a sharp knife wiped clean between cuts.
- Chocolate chips sank to the bottom: The batter was too warm when the chips went in. If your butter was very hot, let the batter rest for five minutes before folding in any mix-ins.
- Flat, dense bars with no lift: Check your baking powder — it loses potency over time. Test it by dropping half a teaspoon into hot water; it should bubble immediately. If it doesn’t, replace it.
Storage and make-ahead
Blondies keep well at room temperature for up to five days when stored in an airtight container — layer them between sheets of parchment if you’re stacking them. For gifting, they hold up beautifully wrapped individually in parchment and tied with twine; skip any powdered-sugar dusting before packaging, since it turns tacky within a few hours. To freeze, wrap the fully cooled, uncut slab tightly in plastic wrap and then foil, and freeze for up to three months. Thaw at room temperature still wrapped, then slice once fully thawed. You can also bake the bars two days ahead — they’re actually a little chewier on day two than straight out of the oven.
Classic Blondies
Equipment
- 9x13 inch baking pan
- Mixing Bowls
- Whisk
- Rubber spatula
- Cooling Rack
Ingredients
- 1 cup unsalted butter melted
- 2 cups light brown sugar
- 2 tsp vanilla extract
- 2 large eggs at room temperature
- 2 cups all-purpose flour
- 1 tsp baking powder
- ¼ tsp salt
- 1 cup semi-sweet chocolate chips optional
Instructions
- Preheat your oven to 350°F (175°C). Grease a 9x13 inch baking pan and set aside.
- In a large mixing bowl, whisk together the melted butter and light brown sugar until smooth and creamy.
- Add the vanilla extract and eggs, one at a time, whisking well after each addition.
- In another bowl, whisk together the all-purpose flour, baking powder, and salt. Gradually fold the dry ingredients into the wet mixture using a rubber spatula, mixing until just combined.
- If desired, fold in the chocolate chips, ensuring they are evenly distributed throughout the batter.
- Pour the batter into the prepared baking pan, spreading it evenly with a spatula.
- Bake for 25 minutes, or until the top is golden brown and a toothpick inserted into the center comes out clean.
- Allow the blondies to cool completely on a cooling rack before slicing into bars.
Notes
Lori’s Tips:Â
- For a nutty twist, consider adding 1/2 cup of chopped pecans or walnuts to the batter.
- If you prefer a denser blondie, reduce the baking powder to 1/2 tsp.
- Ensure the butter is completely melted to achieve a smooth, chewy texture in the final product.
Nutrition
Frequently asked questions
Can I use a different pan size?
An 8×8 or 9×9 inch pan will work, but the bars will be significantly thicker and will need more time in the oven — start checking at 30 minutes and go from there. The edges will set before the center, so use the toothpick test rather than relying on color alone.
Do I need to line the pan with parchment?
Greasing the pan is enough to prevent sticking, but lining it with parchment makes lifting the whole slab out much easier before slicing. If you plan to cut clean, even bars — especially for gifting — the parchment lift is worth the extra minute.
Can I double the recipe?
Yes, but use two separate 9×13 pans rather than one larger pan. Spreading a doubled batch too thick in a single pan makes it very hard to bake the center through without overbaking the edges.
My batter looks very thick — is that right?
Yes, blondie batter is noticeably thicker than cake batter. Spread it into the corners of the pan with a spatula and don’t worry — it loosens slightly as it bakes.
Can I make these without eggs?
One flax egg (1 tablespoon ground flaxseed mixed with 3 tablespoons water, rested for five minutes) per egg is the most reliable substitute here. The bars will be slightly less chewy and a little more dense, but they bake through well.
How do I know when they’re done if my oven runs hot?
Start checking at 20 minutes. The edges should look set and the top should be golden, but the center can still look very slightly underdone — it firms up as it cools. An oven thermometer is the single most useful tool for consistent bar results.
If you liked this one
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- Nanaimo Bars
- Almond Joy Cheesecake Bars
- Brown Butter Rice Krispie Treats