These Brown Butter Pecan Chocolate Chunk Blondies are everything a great American bakery-style blondie should be: chewy around the edges, soft and fudgy in the center, deeply buttery, and packed with pools of melted chocolate and crunchy toasted pecans.

Browning the butter is what makes these special. As the milk solids toast, ordinary butter develops rich, nutty caramel notes that pair perfectly with brown sugar, vanilla, pecans, and dark chocolate. A touch of flaky sea salt on top brings everything into balance.

They're easy enough for weekend baking but impressive enough for holiday cookie trays, bake sales, potlucks, Thanksgiving, or gifting. For the best texture, let them cool completely before slicing—if you can resist eating one warm.

Ingredients

For the Brown Butter Blondies

• 1 cup (2 sticks) unsalted butter
• 1½ cups packed dark brown sugar
• ¼ cup granulated sugar
• 2 large eggs, room temperature
• 1 large egg yolk, room temperature
• 2 teaspoons pure vanilla extract
• 2 cups all-purpose flour
• 1 tablespoon cornstarch
• 1 teaspoon baking powder
• ½ teaspoon kosher salt
• 1 cup toasted pecans, roughly chopped
• 1¼ cups semisweet or dark chocolate chunks

For Finishing

• ¼ cup additional toasted pecans
• ¼ cup additional chocolate chunks
• Flaky sea salt, optional

How to Make Brown Butter Pecan Chocolate Chunk Blondies

Step 1 – Prepare the Pan

Preheat the oven to 350°F (175°C).

Line a 9×9-inch baking pan with parchment paper, leaving some overhang on the sides so the blondies can be lifted out easily.

Lightly grease the parchment.

Step 2 – Toast the Pecans

Spread the pecans on a baking sheet.

Toast for approximately 6–8 minutes, until fragrant and slightly darker.

Let them cool, then roughly chop.

Toasting is worth the extra few minutes—it dramatically improves the nutty flavor.

Brown the Butter

Step 3 – Melt the Butter

Place the butter in a light-colored saucepan over medium heat.

Allow it to melt completely.

Continue cooking while stirring or swirling frequently.

Step 4 – Watch for the Browned Milk Solids

The butter will foam heavily before the milk solids begin turning golden.

Continue cooking until you see deep golden-brown specks on the bottom and the butter smells distinctly nutty and toasted.

Immediately remove it from the heat.

Pour the brown butter—including all the flavorful browned bits—into a large heatproof mixing bowl.

Let cool for approximately 15–20 minutes.

Make the Blondie Batter

Step 5 – Add the Sugars

Add the dark brown sugar and granulated sugar to the slightly cooled brown butter.

Whisk vigorously until well combined.

Step 6 – Add the Eggs

Add the eggs and extra egg yolk one at a time.

Whisk thoroughly after each addition.

Add the vanilla and whisk until the mixture looks smooth, thick, and glossy.

Step 7 – Combine the Dry Ingredients

In a separate bowl, whisk together:

• All-purpose flour
• Cornstarch
• Baking powder
• Kosher salt

Step 8 – Combine Wet & Dry

Fold the dry ingredients into the brown-butter mixture using a spatula.

Mix only until a few flour streaks remain.

Don't overmix.

Step 9 – Add the Good Stuff

Fold in 1 cup toasted pecans and 1¼ cups chocolate chunks.

The batter will be thick. That's normal.

Bake the Blondies

Step 10 – Fill the Pan

Transfer the batter to the prepared pan.

Spread it evenly into the corners using an offset spatula.

Scatter the remaining pecans and chocolate chunks over the top.

Press them very lightly into the batter.

Step 11 – Bake

Bake for approximately 25–32 minutes.

The edges should look set and lightly golden, while the center should remain slightly soft.

A toothpick inserted into the center should come out with moist crumbs, not completely clean.

Step 12 – Add Flaky Salt

While the blondies are still warm, sprinkle the surface lightly with flaky sea salt if desired.

That little salty finish works especially well with brown butter, pecans, and chocolate.

Step 13 – Cool

Let the blondies cool completely in the pan.

Use the parchment overhang to lift them onto a cutting board.

Cut into 16 squares.

Chef's Tips for the Best Blondies

• Don't rush the brown butter. You want genuinely toasted milk solids, but not black or burned ones.
• Use a light-colored saucepan so you can clearly see when the butter begins browning.
• Scrape every browned bit from the saucepan into the batter. That's where much of the flavor lives.
• Let the brown butter cool slightly before adding eggs.
• Dark brown sugar gives the blondies deeper caramel flavor and helps create a chewy texture.
• The extra egg yolk adds richness without making the blondies cakey.
• Cornstarch helps create a softer, more tender center.
• Toast the pecans before adding them.
• Roughly chopped chocolate bars create bigger, irregular pools of chocolate than standard chips.
• Don't overmix after adding flour.
• Don't overbake. Blondies continue setting as they cool.
• For clean squares, cool completely before cutting.

The Secret to Chewy, Fudgy Blondies

The difference between a great blondie and a blondie that tastes like vanilla cake comes down to fat, sugar, eggs, and baking time.

Brown sugar provides both moisture and chewiness, while the extra egg yolk adds richness. Using only a modest amount of leavening prevents the bars from becoming too fluffy.

Most importantly, pull the blondies from the oven while the center is still slightly soft.

If you wait for a completely clean toothpick, they're likely already overbaked.

After cooling, the center settles into that dense, buttery, chewy texture you want.

Why Brown Butter Makes Them Better

Regular melted butter gives blondies richness.

Brown butter gives them character.

During browning, the milk solids toast and develop flavors reminiscent of hazelnuts, caramel, and toffee. Those flavors naturally complement brown sugar and toasted pecans.

The result tastes noticeably deeper and more complex without requiring additional extracts or artificial flavorings.

Delicious Variations

Salted Caramel Pecan Blondies

Drizzle thick salted caramel over the cooled blondies and finish with flaky sea salt.

Maple Pecan Blondies

Add 2 tablespoons pure maple syrup to the wet ingredients for a cozy maple flavor.

Toffee Chocolate Chunk Blondies

Fold ¾ cup toffee bits into the batter along with the chocolate.

Bourbon Pecan Blondies

Add 1 tablespoon bourbon with the vanilla for a warm Southern-inspired flavor.

White Chocolate Pecan Blondies

Replace half or all of the semisweet chocolate with white chocolate chunks.

Triple Chocolate Blondies

Use a combination of milk, semisweet, and dark chocolate chunks.

How to Get Those Bakery-Style Chocolate Pools

Skip uniform chocolate chips and chop a good-quality chocolate bar into different-sized pieces.

Small pieces melt throughout the batter while larger chunks remain as dramatic pockets of chocolate.

Save some of the biggest chunks and press them into the surface immediately before baking.

You can even add a few more chocolate pieces to the top as soon as the blondies come out of the oven. The residual heat will soften them without completely burying them in the batter.

How to Get Perfect Clean Slices

Allow the blondies to cool completely—ideally for at least 1–2 hours.

For extremely sharp bakery-style squares, refrigerate the cooled blondies for about 30 minutes before slicing.

Use a large sharp knife and wipe the blade clean between cuts.

If you prefer warm, gooey blondies, simply reheat individual squares after slicing.

What to Serve With

• Vanilla bean ice cream
• Salted caramel ice cream
• Hot coffee
• Cold milk
• Espresso
• Whipped cream
• Salted caramel sauce
• Warm chocolate sauce

For an especially indulgent dessert, warm one blondie for about 10–15 seconds and serve it with vanilla ice cream and a tiny drizzle of salted caramel.

Make-Ahead Tips

These blondies are excellent for making ahead because their brown-sugar base helps them stay moist.

Bake them 1 day before serving, cool completely, and store tightly covered at room temperature.

You can also prepare the brown butter ahead. Refrigerate it, then gently warm it back to a liquid state before making the batter.

Storage

Room Temperature

Store completely cooled blondies in an airtight container for up to 4 days.

Place parchment between layers to prevent sticking.

Refrigerator

For longer storage, refrigerate for up to 1 week.

Let the blondies return to room temperature before serving for a softer, chewier texture.

Freezer

Wrap individual blondies tightly and place them in a freezer-safe container.

Freeze for up to 3 months.

Thaw at room temperature or warm briefly in the microwave before serving.

Notes

• Pecans are the ideal nut here because their buttery flavor naturally complements brown butter and brown sugar.
• Dark chocolate or semisweet chocolate provides enough bitterness to balance the sweet blondie base.
• A small amount of flaky sea salt makes the caramel and chocolate flavors taste more pronounced.
• The blondies will look slightly underdone when they first leave the oven but continue firming as they cool.
• These Brown Butter Pecan Chocolate Chunk Blondies are especially perfect for Thanksgiving, Christmas cookie trays, fall baking, bake sales, potlucks, game-day desserts, homemade gifts, or an easy American-style dessert for a crowd.