Ingredients
Equipment
Method
- Follow the instructions on your dark chocolate brownie mix box to prepare the brownie batter. Usually, this involves combining the brownie mix with oil, water, and eggs. Set this prepared brownie batter aside.1 (18.25 ounce) box dark chocolate brownie mix
- In a large mixing bowl, cream together the softened unsalted butter and granulated sugar until light and fluffy. This can be done with an electric mixer or by hand with a sturdy whisk.1 cup (2 sticks) unsalted butter, softened, 1 ¾ cups granulated sugar
- Beat in the two large eggs one at a time, ensuring each is fully incorporated before adding the next. Stir in the vanilla extract.2 large eggs, 2 teaspoons vanilla extract
- In a separate medium bowl, whisk together the all-purpose flour, baking soda, and salt.1 ½ cups all-purpose flour, ½ teaspoon baking soda, ½ teaspoon salt
- Gradually add the dry ingredients to the wet ingredients in the large mixing bowl, mixing on low speed or by hand until just combined. Be careful not to overmix.1 ½ cups all-purpose flour, ½ teaspoon baking soda, ½ teaspoon salt
- Fold in ¾ cup of the bittersweet chocolate chips and ¾ cup of the milk chocolate chips into the cookie dough.6 ounces bittersweet chocolate chips, divided, 6 ounces milk chocolate chips, divided
- Pour about half of the prepared brownie batter into the bottom of a greased 9x13 inch baking pan. Spread it evenly to cover the bottom.1 (18.25 ounce) box dark chocolate brownie mix
- Dollop spoonfuls of the chocolate chip cookie dough over the brownie batter. Use the back of a spoon or your fingers to gently spread the cookie dough as evenly as possible over the brownie layer, creating a marbled effect. Don't worry if it's not perfectly covered; the brownie will spread as it bakes.1 (18.25 ounce) box dark chocolate brownie mix
- Carefully spoon the remaining brownie batter over the cookie dough layer, trying to cover as much of the cookie dough as possible. Gently spread it to create a relatively even top layer.1 (18.25 ounce) box dark chocolate brownie mix
- Sprinkle the remaining ¼ cup of bittersweet chocolate chips and ¼ cup of milk chocolate chips evenly over the top of the brookie.6 ounces bittersweet chocolate chips, divided, 6 ounces milk chocolate chips, divided
- Preheat your oven to 350°F (175°C). Bake for 30-40 minutes, or until the edges are set and a toothpick inserted near the center comes out with moist crumbs attached (not wet batter). The center may still look slightly soft, as it will continue to set as it cools.
- Let the brookie cool completely in the pan on a wire rack before cutting into squares. This is crucial for clean cuts and the best texture.
Notes
Make sure to let the brookie cool completely before cutting for the best texture and cleanest cuts.
