1 cup butter (2 sticks), room temperature

3/4 cup sugar

3/4 cup brown sugar

1 egg

2 teaspoons vanilla extract

1 cup all purpose flour

1 cup whole wheat flour

1 teaspoon baking soda

1 cup semi- sweet chocolate chips

1 cup white chocolate chips

1 cup walnuts, toasted

Preheat the oven to 350 °F and grease two 5-inch cast iron pans or 1 12-inch pan.
Next, in a large bowl mix together the butter and the sugars with a mixer until light and creamy.
Add in the egg and vanilla. Next, add in the flour and baking soda and mix only until just combined.
Stir in the chocolate chips and nuts and then spoon the batter int