Chocolate Chip Cookie Bars

Name: Chocolate Chip Cookie Bars
Prep time: 15 min
Cook time: 34 min
Total time: 105 min
Ingredients: 2.25 cups all-purpose flour (Provides structure.); 1 teaspoon baking soda (Gives lift.); 1.5 teaspoons cornstarch (Adds tenderness.); 0.5 teaspoon salt (Balances sweetness.); 0.75 cups unsalted butter, melted (Yields a softer bar.); 1 cup packed light brown sugar (Adds moisture.); 0.33 cups granulated sugar (Contributes sweetness.); 1 large egg (Binds the dough.); 1 large egg yolk (Increases richness.); 2 teaspoons pure vanilla extract (Boosts flavor.); 1 cup semi-sweet chocolate chips (Classic pockets of chocolate.); optional sprinkle of flaky sea salt (Enhances flavor.)

These chocolate chip cookie bars are everything you want when you need a reliable, crowd-pleasing dessert. They combine the deep, caramel notes of brown sugar with the tender crumb that comes from a splash of melted butter and cornstarch. The interior is soft and slightly chewy, while the edges bake up golden and lightly crisp. The aroma while baking is warm and buttery with bright vanilla and chocolate pocketed throughout. These bars are ideal for bake sales, weeknight dessert cravings, potlucks, or an after-school treat with a glass of milk. They are simple to make, easy to slice, and travel well, so you can bake ahead and bring them to gatherings. Finish with a sprinkle of flaky sea salt for a grown-up contrast to the sweet chocolate chips, or press extra chips on top for a dramatic presentation.

Ingredients

2 and 1/4 cups all-purpose flour
Provides structure and the familiar cookie bar texture.
1 teaspoon baking soda
Gives lift and helps the bars spread evenly.
1 and 1/2 teaspoons cornstarch
Adds tenderness for a soft, cake-like crumb.
1/2 teaspoon salt
Balances sweetness and enhances flavor.
3/4 cup unsalted butter, melted and slightly cooled
Melted butter yields a softer, chewier bar and more even mixing.
1 cup packed light brown sugar
Adds moisture and a rich, caramel flavor.
1/3 cup granulated sugar
Contributes sweetness and helps with light browning.
1 large egg, at room temperature
Binds the dough and adds lift.
1 large egg yolk, at room temperature
Extra yolk increases richness and chew.
2 teaspoons pure vanilla extract
Boosts flavor with warm vanilla notes.
1 cup semi-sweet chocolate chips
The classic pockets of chocolate throughout the bars.
Optional: sprinkle of flaky sea salt
A finishing touch that heightens the chocolate and caramel flavors.

Step-by-step Instructions

Preheat the oven to 350°F (177°C) and line a 9-inch square baking pan with parchment paper. Make sure the parchment comes up the sides for easy lifting after baking.
In a large bowl, whisk together the flour, baking soda, cornstarch, and salt until evenly combined. This ensures even distribution of rising agent and tenderizer.
In a medium bowl, whisk the melted butter, brown sugar, and granulated sugar until no lumps remain. Whisk until smooth so the sugars dissolve into the butter.
Add the egg, extra egg yolk, and vanilla extract to the sugar mixture and whisk until well combined. Warm ingredients mix together more evenly, so room temperature eggs help.
Combine the wet ingredients with the dry ingredients, mixing until just incorporated. Do not overmix; stop when there are no large streaks of flour.
Gently fold in the chocolate chips. Save a small handful to press on top if you want a decorative finish.
Transfer the dough to the prepared baking pan and press it into an even layer. Use lightly greased hands or the back of a spatula to avoid sticking.
If desired, sprinkle with flaky sea salt and press additional chocolate chips on top. This gives a pretty look and extra melty pockets.
Bake for 30 to 34 minutes or until lightly browned and a toothpick inserted in the center comes out mostly clean. The center should be set but still soft; it will firm as it cools.
Allow to cool in the pan for at least an hour before lifting out and cutting into squares. Cooling completely makes cleaner slices.

Recipe Details

Prep Time: 15 minutes
Cook Time: 30 to 34 minutes
Total Time: About 1 hour 45 minutes, including at least 1 hour cooling
Servings: Makes about 16 squares
Calories: Approximately 270 calories per serving

Tips, Storage & Variations

Tips

Use room temperature eggs for smoother mixing and better emulsion with the butter.
Press the dough evenly into the pan for uniform baking and consistent texture.
Check at 30 minutes and rotate the pan if your oven has hot spots.

Storage

Store cooled bars in an airtight container at room temperature for up to 3 days.
For longer storage, refrigerate for up to 1 week, letting bars come to room temperature before serving for best texture.

Freezing

Freeze individual squares or the whole pan wrapped tightly in plastic wrap and aluminum foil for up to 3 months. Thaw overnight in the refrigerator or at room temperature for a few hours.

Variations using only existing ingredients

Extra chocolate: Fold in most chips and press additional chips on top before baking for a chocolate-forward version.
Salty-sweet: Finish with a generous sprinkle of flaky sea salt to contrast the sweet chips and brown sugar.

Frequently Asked Questions

How do I know when the bars are done?
A toothpick inserted into the center should come out mostly clean with a few moist crumbs. The center will firm up as it cools.
Can I use softened rather than melted butter?
The recipe is written for melted butter to create the intended texture. Softened butter will change mixing and may yield a different crumb.
Why is there cornstarch in the recipe?
Cornstarch tenderizes the dough, creating a softer, slightly cake-like interior.
Can I double this recipe?
Yes, double the ingredients and bake in a larger pan, adjusting baking time as needed and checking doneness earlier.
Can I use dark or milk chocolate chips instead?
Yes, you can substitute other chips from the same ingredient list. Baking time remains the same.
Is the flaky sea salt necessary?
It is optional. It enhances flavor but can be omitted without changing the bake process.

Conclusion

These Chocolate Chip Cookie Bars are a dependable, comforting dessert that balances soft chew and melty chocolate. If you want a reference for a similar technique and texture, see Soft Chocolate Chip Cookie Bars – Preppy Kitchen for inspiration. For another take and serving ideas, check out Chocolate Chip Cookie Bars – Our Best Bites. I hope you enjoy baking these and sharing them with friends and family. Please try the recipe, make it your own with a pinch of flaky salt, and share how yours turned out with someone you care about.