I used the recipe below earlier this year for a baby shower. I also did one without the nuts. It was a hit. I didn't add sugar, cocoa or whip cream.
I used a 12 inch round cake pan.
* 2 sticks unsalted butter, softened
* 1 cup packed light brown sugar
* 1/2 cup granulated sugar
* 2 large eggs
* 2 cups plus 2 tablespoons all-purpose flour
* 1 teaspoon baking soda
* 1/2 teaspoon salt
* 1 1/2 teaspoons pure vanilla extract
* 1 1/2 cups bittersweet chocolate chips
* 3/4 cup white chocolate chips
* 1/2 cup chopped macadamia nuts
* 1/2 cup chopped toasted walnuts
* Confectioners' sugar, for garnish
* Sweetened cocoa, for garnish
* Sweetened whipped cream, accompaniment
Preheat the oven to 375 degrees F. Line a 14-inch, light colored, round pizza pan with parchment paper and grease the parchment paper.
In a large bowl, cream the butter and sugars. Add the eggs, beating well after the addition of each.
In a bowl, combine the flour, baking soda, and salt and mix with a whisk. Add to the butter mixture, mixing to incorporate, and add the vanilla extract. Fold in the dark and white chips and the nuts. Spread across the bottom of the prepared pan and bake until the edges are golden and the cookie is set but the center is still slightly soft, 20 to 25 minutes. Cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.
To serve, sift confectioners' sugar and sweetened cocoa over the top, and cut into wedges. Serve sweetened whipped cream on the side.