The BEST Blondie Recipe
I bake a lot, and I test more blondie recipes than I can count. This one rose to the top because it’s forgiving, fast, and reliably delivers dense, chewy bars with a lightly crisp top and tender interior. The balance of brown and granulated sugar, a touch of corn starch, and the option to choose your favorite chips make it versatile for any moment—weeknight snack or holiday tray.
There’s no gimmick here: melted butter for flavor and shine, an extra egg yolk for chew and richness, and a short bake time so the bars stay moist. The chips you choose—peanut butter, butterscotch, white, or semi-sweet—turn these into something you can tailor. Follow the steps exactly for best results; the method matters a lot with blondies.
If you want practical tips as you go, I’ll walk you through why each ingredient matters, common mistakes to avoid, and how to store and reheat these so they taste fresh for days. Let’s get to it.
The Ingredient Lineup
Ingredients
- 1 cup unsalted butter — melted and cooled slightly; provides fat for richness and chew, and cooling prevents cooking the eggs when mixed.
- 1 ⅔ cups brown sugar — packed; supplies moisture and that deep caramel flavor that blondies are known for.
- ⅔ cup granulated sugar — adds balance and helps with structure and a slightly crisp top.
- 2 eggs — room temperature; they bind the batter and contribute to structure and lift.
- 1 egg yolk — room temperature; extra yolk adds richness and chewiness without extra rise.
- 1 tablespoon vanilla extract — rounds flavors and enhances the brown-sugar notes.
- 2 ¼ cups all purpose flour — spooned and leveled; the primary structure agent—measure accurately to avoid dryness.
- 2 tablespoons corn starch — helps tenderize so the bars are soft, not cakey.
- 1 teaspoon baking powder — a touch of lift so the blondies aren’t flat and dense.
- 1 teaspoon salt — balances sweetness and sharpens flavors.
- 1 cup butterscotch, peanut butter, semi-sweet, or white chocolate chips — your choice; fold-ins add pockets of flavor and texture—pick one or mix two if you like.
The Method for Blondie Recipe
- Preheat the oven to 350°F. Lightly grease a 13 x 9-inch baking pan and line it with parchment paper; set aside.
- In a large bowl, combine 1 cup unsalted butter (melted and cooled slightly), 1 ⅔ cups brown sugar (packed), and ⅔ cup granulated sugar. Stir until smooth and combined.
- Add 2 eggs and 1 egg yolk (both at room temperature) and 1 tablespoon vanilla extract to the bowl. Stir until the eggs are fully incorporated and the mixture is uniform.
- In a separate bowl, whisk together 2 ¼ cups all purpose flour (spooned and leveled), 2 tablespoons corn starch, 1 teaspoon baking powder, and 1 teaspoon salt to evenly distribute the dry ingredients.
- Add the dry ingredients to the wet ingredients and stir just until combined—mix only until no large streaks of flour remain to avoid overmixing.
- Fold in 1 cup butterscotch, peanut butter, semi-sweet, or white chocolate chips (your choice) until evenly distributed.
- Transfer the batter to the prepared baking pan and spread it into an even layer with a spatula.
- Bake for 22 to 27 minutes, checking near the edge with a toothpick; the blondies are done when a toothpick inserted near the edge comes out with just a few moist crumbs.
- Allow the blondies to cool completely in the pan on a wire rack before lifting out (using the parchment) and cutting into bars.
Why This Blondie Recipe Stands Out
This version nails the texture trifecta: shiny top, chewy interior, and defined edges. That comes from three simple decisions: melted butter, a mix of brown and granulated sugar, and a small addition of corn starch. Melted butter creates a denser, fudgier crumb than creamed butter. Brown sugar’s molasses keeps the bars moist and adds depth, while the granulated sugar lifts the crust just enough to crisp.
The extra egg yolk is a quiet but powerful addition. It increases richness without adding air, which helps the blondies set with a tender chew rather than a cakey crumb. And the short bake—checking between 22 and 27 minutes—prevents overbaking. Pulling them when there are a few moist crumbs ensures they finish set while remaining soft.
Substitutions by Category
- Butter — You can use salted butter in a pinch; reduce the added salt slightly or omit it. Unsalted is preferred for control.
- Sugars — If you only have dark brown sugar, use it for a deeper molasses flavor. White sugar can replace the granulated sugar 1:1.
- Chips & Mix-ins — Any of the listed chips work. Swap in chopped nuts, toffee bits, or a mix of two chip types. Don’t exceed the listed cup too much or the bars will be overloaded.
- Flour — Stick with all-purpose for structure. For slightly chewier blondies, a blend with a couple tablespoons of bread flour will increase chew, but measure carefully.
- Eggs — The two whole eggs plus extra yolk are important for texture; reducing them will change structure and may produce a drier bar.
Kitchen Gear Checklist
- 13 x 9-inch baking pan — the recipe is calibrated to this size for thickness and bake time.
- Parchment paper — for easy removal and clean edges.
- Mixing bowls — one large for wet, one for dry.
- Melt-proof bowl or small saucepan — to melt the butter.
- Spatula and whisk — for folding and mixing.
- Measuring cups and spoons — spoon and level flour for accuracy.
- Wire rack and toothpick — for cooling and doneness check.
Mistakes That Ruin Blondie Recipe
- Overmixing the batter — Leads to tough blondies. Stir only until the flour streaks disappear.
- Overbaking — Blondies continue to set after you remove them from the oven. If you wait until a toothpick comes out clean, they’ll be dry.
- Using hot melted butter — Add the butter after it’s cooled slightly. Hot butter can scramble eggs and change texture.
- Incorrect flour measurement — Packing or scooping flour directly with a measuring cup can add too much. Spoon into the cup and level off.
- Cutting too soon — They must cool completely in the pan; warm blondies will fall apart.
Holiday & Seasonal Touches
These blondies are a great base for seasonal flavors. For fall, stir in a teaspoon of ground cinnamon and swap half the chips for chopped toasted pecans. Around the holidays, mix in dried cranberries and white chocolate chips for a festive contrast. In summer, add chopped roasted peanuts and a sprinkle of flaky sea salt on top to highlight sweet-and-salty notes.
For a holiday gift, cut into neat bars, stack with parchment, and tie with a ribbon. They hold up well at room temperature for a couple of days in an airtight tin, making them a convenient, crowd-pleasing treat.
Method to the Madness
Here’s why the steps are ordered the way they are. You melt the butter first so it integrates smoothly with the sugars—brown sugar dissolves into melted fat more readily, which helps create the glossy top and tender interior. Cooling the butter slightly prevents cooking the eggs when you add them; gently warmed butter is ideal.
Whisking dry ingredients separately ensures the corn starch and baking powder are evenly distributed. Corn starch is a small but effective tenderizer; it changes the crumb from cakey to soft and a little fudgy. Folding chips last prevents them from breaking down into the batter and keeps pockets of melted goodness throughout the bars.
Finally, spreading the batter evenly and checking doneness near the edge are practical choices. The center takes slightly longer to set; the edge is where overbake shows first. Pull them when a toothpick has a few moist crumbs and you’ll have bars that are set but still silky.
Cooling, Storing & Rewarming
Let the blondies cool completely in the pan on a wire rack before lifting them out with the parchment. This step is essential. If you try to remove or cut them while warm, they’ll crumble and lose shape.
Store at room temperature in an airtight container for up to 3 days. For longer storage, freeze tightly wrapped bars for up to 3 months. Thaw at room temperature or warm gently in a 300°F oven for 8–10 minutes to revive that just-baked texture.
If you’re reheating a single serving, a 10–15 second blast in the microwave softens them nicely—watch closely so they don’t become too hot and lose structure.
Reader Questions
Can I halve the recipe?
Yes. Halve everything and use a smaller pan (roughly 8 x 8 inches). Watch bake time closely; smaller pan may finish a bit sooner.
What if I don’t have corn starch?
Omit it if necessary. The texture will be slightly less tender, leaning more cakey, but it will still be good. You might reduce flour by a tablespoon if you omit corn starch to preserve tenderness.
Can I add mix-ins like nuts or dried fruit?
Absolutely. Fold in up to 1 cup total of additional mix-ins, but keep the overall volume similar to avoid thinning the batter.
Why check near the edge?
The center retains heat longer and can be soft while the edges are closer to doneness. Checking near the edge gives a reliable doneness cue without overbaking the whole pan.
That’s a Wrap
These blondies are straightforward, forgiving, and easily customized. Follow the ingredient list and method as written for the best, most reliable results—melt the butter, measure the flour correctly, and watch the bake time. Try different chips and small seasonal tweaks, but keep the fundamentals intact.
Make a pan, let it cool completely, slice into bars, and enjoy. If you try this recipe, I’d love to hear which chips you picked and how you tweaked it. Happy baking.
The BEST Blondie Recipe
Ingredients
Equipment
Method
- Preheat the oven to 350°F. Lightly grease a 13 x 9-inch baking pan and line it with parchment paper; set aside.
- In a large bowl, combine 1 cup unsalted butter (melted and cooled slightly), 1 ⅔ cups brown sugar (packed), and ⅔ cup granulated sugar. Stir until smooth and combined.
- Add 2 eggs and 1 egg yolk (both at room temperature) and 1 tablespoon vanilla extract to the bowl. Stir until the eggs are fully incorporated and the mixture is uniform.
- In a separate bowl, whisk together 2 ¼ cups all purpose flour (spooned and leveled), 2 tablespoons corn starch, 1 teaspoon baking powder, and 1 teaspoon salt to evenly distribute the dry ingredients.
- Add the dry ingredients to the wet ingredients and stir just until combined—mix only until no large streaks of flour remain to avoid overmixing.
- Fold in 1 cup butterscotch, peanut butter, semi-sweet, or white chocolate chips (your choice) until evenly distributed.
- Transfer the batter to the prepared baking pan and spread it into an even layer with a spatula.
- Bake for 22 to 27 minutes, checking near the edge with a toothpick; the blondies are done when a toothpick inserted near the edge comes out with just a few moist crumbs.
- Allow the blondies to cool completely in the pan on a wire rack before lifting out (using the parchment) and cutting into bars.
Notes
Storage Information
Leftover blondies can be stored in an airtight container at room temperature for up to 4 days.
To freeze,
let the blondie recipe cool completely, cut into bars and store in airtight, freezer-safe container for up 3 months. Use parchment between layers for easy thawing and serving. Let thaw overnight in the fridge or at room temperature.
