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4.32 from 16 votes
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Chocolate Chip Cookie Bars

Created by: Courtney
Prep Time 10 minutes
Cook Time 28 minutes
Total Time 38 minutes
Yield: 16 bars
These chocolate chip cookie bars bake up thick, chewy, and loaded with pockets of melty semisweet chocolate. The edges are golden and crisp while the centers stay soft and gooey. They come together in one bowl and one pan with no chilling, no scooping, and no fuss. Perfect for lunchboxes, parties, or whenever your sweet tooth strikes.

Ingredients 

  • ½ cup (114 g) unsalted butter (melted)
  • ¾ cup (165 g) dark brown sugar
  • ¼ cup (50 g) granulated sugar
  • 1 (1) large egg (room temperature)
  • 3 tsp (3 tsp) vanilla extract
  • 1 ½ cups (188 g) all-purpose flour
  • 1 tsp (1 tsp) cornstarch
  • ½ tsp (0.5 tsp) baking soda
  • ½ tsp (0.5 tsp) salt
  • 1 ½ cups (270 g) semisweet chocolate chips (divided - 1 cup for the cookie dough and ½ cup for the top of the bars)

Instructions

  • Preheat the oven to 350℉ (177℃).  Prepare an 8x8 inch baking pan with nonstick cooking spray and parchment paper.
  • In a large mixing bowl, whisk together the melted unsalted butter, dark brown sugar, and granulated sugar until well combined. Add in the egg and vanilla extract and whisk until combined and smooth.
  • Add in the all-purpose flour, cornstarch, baking soda, and salt. Mix with a rubber spatula until a soft cookie dough forms. Fold in 1 cup of the semisweet chocolate chips until they are well dispersed throughout the cookie dough.
  • Spread the chocolate chip cookie dough in an even layer in the prepared baking pan. Press the additional ½ cup of semisweet chocolate chips in the top of the cookie dough.
  • Bake the cookie bars for 26 to 28 minutes, until the edges are golden-brown and the center is very slightly underbaked. Cool the cookie bars in the pan to room temperature. Remove the bars from the pan and cut into squares.

Notes

Storing & Serving:
  • Room temperature: Store the cookie bars in an airtight container or resealable storage bag at room temperature for 2 to 3 days. Serve at room temperature or heat in the microwave for 10 seconds to melt the chocolate. 
  • Freezer: Store the cookie bars in an airtight container or resealable freezer storage bag for up to 3 months.
Baking Tools & Supplies (affiliate links)8x8 inch baking pan | Offset spatula | Parchment paper
Note: Metric conversions and nutritional information are calculated automatically. I cannot guarantee the accuracy of this information.
Recipe Update: This recipe was updated in January 2026. 

Nutrition

Serving: 1bar | Calories: 249kcal | Carbohydrates: 31g | Protein: 3g | Fat: 13g | Saturated Fat: 7g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 4g | Trans Fat: 0.2g | Cholesterol: 26mg | Sodium: 116mg | Potassium: 129mg | Fiber: 2g | Sugar: 19g | Vitamin A: 201IU | Calcium: 24mg | Iron: 2mg

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