These bakery-style cookies are thick, gooey, and packed with both semi-sweet and milk chocolate chips for a deeply rich and satisfying treat.
2 ¾ cups all-purpose flour
1 tsp baking soda
1 ½ tsp cornstarch
¾ tsp salt
1 cup unsalted butter, room temperature
1 cup dark brown sugar, packed
½ cup granulated sugar
2 large eggs
1 egg yolk
2 tsp vanilla extract
1 cup semi-sweet chocolate chips
1 cup milk chocolate chips
In a large bowl, cream butter and both sugars until light and fluffy (2–3 minutes).
Add eggs and egg yolk one at a time, mixing well. Stir in vanilla.
In a separate bowl, whisk flour, baking soda, cornstarch, and salt. Gradually add to wet ingredients.
Fold in both types of chocolate chips.
Cover and refrigerate dough for at least 2 hours.
Preheat oven to 350°F (175°C). Line baking sheets with parchment paper.
Scoop 3-tablespoon-sized dough balls onto prepared sheets.
Bake for 11–13 minutes, until edges are golden and centers look slightly underbaked.
Let rest on sheet for 5–10 minutes, then transfer to wire rack.