Ingredients

Scale

1 cup (2 sticks / 227 g) unsalted butter, browned, slightly cooled
1 ⅓ cups (267 g) light brown sugar, packed
½ cup (100 g) granulated sugar
2 large eggs, room temperature
2 teaspoons pure vanilla extract
2 ¼ cups (281 g) all-purpose flour
2 teaspoons cornstarch
½ teaspoon baking soda
½ teaspoon baking powder
1 teaspoon kosher salt
¼ teaspoon ground cinnamon
1 cup (90 g) old-fashioned oats
1 cup (168 g) white chocolate chips, divided
1 cup (168 g) semi-sweet chocolate chips, divided
Extra White Chocolate & Semi-Sweet Chocolate, chopped

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Instructions

In a medium saucepan over medium-low heat, melt the butter until it foams and turns a deep golden-brown, about 6 to 8 minutes.
Remove from heat, stir in brown sugar and granulated sugar until smooth, and let cool for 10 to 15 minutes.
Preheat oven to 350°F and line a 15x10x1-inch rimmed sheet pan with parchment paper, leaving overhang.
In a large bowl, whisk the cooled butter-sugar mixture with eggs and vanilla until well combined.
Stir in flour, cornstarch, baking soda, baking powder, salt, and cinnamon until just combined; avoid overmixing.
Fold in oats and most of the chocolate chips, reserving some for topping.
Press the dough into the prepared pan evenly and sprinkle the remaining chocolate chips on top, pressing them in gently.
Bake for 18 to 22 minutes until edges are golden and center looks set but slightly soft.
Optional: Sprinkle with chopped chocolate while warm and let melt for extra gooey pockets.
Let cool completely on a wire rack before lifting out and cutting into bars.

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Notes

Ensure that the butter is cooled before mixing with the eggs to avoid scrambling them.
For a chewier texture, slightly underbake the cookies as they will continue to set while cooling.
Feel free to add nuts or dried fruits for additional flavor variations.

Author: Sarah
Prep Time: 20 minutes
Cook Time: 38 minutes
Category: Dessert
Method: Baking
Cuisine: American

Nutrition

Serving Size: 1 cookie
Calories: 200
Sugar: 14g
Sodium: 100mg
Fat: 10g
Saturated Fat: 5g
Unsaturated Fat: 3g
Trans Fat: 0g
Carbohydrates: 26g
Fiber: 1g
Protein: 2g
Cholesterol: 30mg