Step 1

Preheat oven to 350°F. Line a 9x13-inch baking dish with parchment paper and grease with nonstick spray. Set aside.

Step 2

In a large mixing bowl, beat together the butter and brown sugar with an electric mixer on medium speed for 2 minutes.

Step 3

Add eggs, vanilla, salt, and baking powder and mix to combine, scraping down the sides of the bowl.

Step 4

Reduce mixer to low, then add flour. Mix until just combined.

Step 5

Stir in chocolate chunks and chocolate chips.

Step 6

Transfer dough to prepared pan and spread out with a rubber spatula. Bake until edges are set, about 30 minutes. Center will seem slightly underbaked and gooey.

Step 7

Let cool in pan 5 minutes before removing and allowing to cool completely. Once cool, slice and serve. Enjoy!