- 1 cup butter, softened
- 3/4 cup white sugar
- 3/4 cup packed brown sugar
- 2 eggs, divided
- 1 teaspoon vanilla extract
- 2 cups all-purpose flour
- 1/2 cup dark cocoa powder
- 1 teaspoon baking soda
- 1/2 teaspoon salt
- 1 cup chopped walnuts
- 1 cup white chocolate chips
- 1 cup semisweet chocolate chips
- Preheat oven to 350 degrees F (175 degrees C).
- Beat butter, white sugar, and brown sugar together with an electric mixer in a large bowl until smooth and creamy. Beat 1 egg into butter mixture; beat remaining egg and vanilla extract into butter mixture.
- Stir flour, cocoa powder, baking soda, and salt together in a bowl; add to creamed butter mixture and beat until the dry ingredients are integrated into a dough.
- Fold walnuts, white chocolate chips, and semisweet chocolate chips into the dough.
- Drop dough by teaspoonful onto baking sheets.
- Bake in preheated oven until browning along the edges, 9 to 12 minutes.