These chocolate chip cookie bars are everything you love about a classic cookie baked into a thick, chewy slab that is easy to slice and share. The edges bake up lightly golden and crisp while the center stays soft and tender, with melty pockets of semi-sweet chocolate in every bite. The aroma as they bake is warm butter and vanilla with a reassuring sweetness of brown sugar. These bars are perfect for school lunches, potlucks, or an afternoon coffee break when you want a portable, crowd-pleasing dessert. If you enjoy creative cookie hybrids, you might also like the flaky, rolled treats in chocolate cookie cinnamon rolls, which offer a different way to enjoy cookie dough flavors.

Ingredients

• 2 and 1/4 cups all-purpose flour — provides structure for chewy bars; spoon into the cup and level for accuracy.
• 1 teaspoon baking soda — helps the bars rise and spread slightly.
• 1 and 1/2 teaspoons cornstarch — gives a tender, slightly cakey crumb and helps with chewiness.
• 1/2 teaspoon salt — balances sweetness and enhances flavor.
• 3/4 cup unsalted butter, melted and slightly cooled — adds rich flavor and fudgy texture; cool slightly so it does not cook the eggs.
• 1 cup packed light brown sugar — gives moisture and caramel notes for chewiness.
• 1/3 cup granulated sugar — adds sweetness and helps with slight crisping at the edges.
• 1 large egg, at room temperature — binds the dough and contributes to structure.
• 1 large egg yolk, at room temperature — extra fat for a richer, chewier interior.
• 2 teaspoons pure vanilla extract — provides warm aromatic flavor.
• 1 cup semi-sweet chocolate chips — the classic mix-in for melty chocolate pockets.
• Optional: sprinkle of flaky sea salt — enhances contrast and brightens the flavor when used on top.

If you want a filled-cookie spin on chocolate treats, check the lighter-textured ideas in cannoli cookies.

Step-by-step Instructions

1. 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 cooling.
2. In a large bowl, whisk together the flour, baking soda, cornstarch, and salt until combined. Whisking helps distribute the raising agent and cornstarch evenly.
3. In a medium bowl, whisk melted butter, brown sugar, and granulated sugar until smooth. The mixture should look glossy and fully combined.
4. Add the egg, yolk, and vanilla to the sugar mixture and whisk until well combined. Tempering is not needed because the butter is only slightly warm.
5. Mix the wet ingredients with the dry ingredients until just incorporated, then fold in the chocolate chips. Do not overmix; stop when there are no visible streaks of flour.
6. Press the dough into an even layer in the prepared pan, optionally sprinkle with sea salt, and press some chocolate chips on top. Use an offset spatula or lightly oiled hands to get an even surface.
7. Bake for 30-34 minutes until lightly browned. The center should look set but slightly soft; it will continue to firm as it cools.
8. Allow to cool in the pan for at least an hour before lifting out and cutting into squares. Cooling fully helps the bars slice cleanly.

For a sturdier edge and more even browning, rotate the pan halfway through baking and refer to a similar method in chewy Christmas cranberry orange cookies for tips on even baking.

Recipe Details

• Prep Time: 15 minutes
• Cook Time: 30-34 minutes
• Total Time: 45-49 minutes
• Servings: 16 squares
• Calories: approximately 266 kcal per serving

Tips, Storage & Variations

• Practical tips: Use room temperature eggs for better emulsification. Press the dough gently and evenly into the pan to avoid thin spots. If you like a more gooey center, bake closer to 30 minutes; for firmer bars, aim for 34 minutes.
• Storage: Store cooled bars in an airtight container at room temperature for up to 3 days. For best texture, separate layers with parchment.
• Freezing: Wrap individual squares in plastic wrap and place in a freezer-safe container for up to 3 months. Thaw at room temperature or warm briefly in a low oven.
• Flavor variations using existing ingredients only: Sprinkle flaky sea salt on top for a salty-sweet contrast. Press extra chocolate chips on top before baking for more visible chocolate pockets. Slightly underbake and fold in the chips later for a softer, fudgier bar.

Try another chocolate-forward treat in our cookies and cream cookie recipe for inspiration on mix-ins and textures.

FAQ

1. How do I know when the bars are done?

• Look for lightly browned edges and a set center that still has a slight give. They will firm as they cool.

2. Can I use salted butter instead of unsalted?

• Yes, but reduce or omit the added salt to avoid an overly salty result.

3. Why is cornstarch included?

• Cornstarch adds tenderness and helps create a soft, slightly cakey chew in the bars.

4. Do I have to use both an egg and an egg yolk?

• Using both gives extra richness and chew; you can omit the extra yolk but texture will be slightly different.

5. Can I double the recipe?

• Yes, double the ingredients and bake in a larger pan, adjusting the bake time as needed for thickness.

People Also Ask

1. Can I make these bars ahead of time?

• Yes, bake, cool completely, then store in an airtight container for up to 3 days or freeze for longer.

2. What pan size is best for these bars?

• A 9-inch square pan gives bars with the intended thickness and texture.

3. How should I line the pan for easy removal?

• Line the pan with parchment paper that extends up the sides so you can lift the whole slab out after cooling.

4. Can I use a different chocolate type?

• Yes, use the semi-sweet chips provided, or swap for a different chocolate you already have on hand, keeping the amount the same.

5. Will the bars spread too much if the butter is very warm?

• Slightly warm butter is fine, but if it is hot it can cook the eggs and change the texture; allow melted butter to cool briefly.

6. Are these bars sturdy enough to pack for lunch?

• Yes, once fully cooled they hold shape well and travel nicely in a lunch box.

7. Why do the edges get crisp while the center stays soft?

• The smaller surface area at the center retains more moisture while the edges lose moisture faster and brown more.

8. How can I get chewier bars without changing ingredients?

• Bake at the lower end of the time range and avoid overmixing the dough to keep the texture dense and chewy, and check tips in easy cherry chip cake recipe for texture adjustments in dense bakes.

Conclusion

These Chocolate Chip Cookie Bars are a comforting, reliable recipe that delivers soft, chewy centers and lightly crisp edges with pockets of melty chocolate in every bite. They are simple to make, easy to slice for sharing, and versatile enough to adapt with the optional sprinkle of flaky sea salt. If you want to compare a similarly soft bar version, check this version from Soft Chocolate Chip Cookie Bars – Preppy Kitchen for another take. For a classic, tested approach with helpful tips, see the recipe at Chocolate Chip Cookie Bars – Our Best Bites. Give these a try, and if you love them, share a photo and your favorite tweak with friends and family for a cozy, happy bake.