1/2 cup salted butter (see note)
1/2 cup brown sugar
1/2 cup white sugar
1 whole egg
1 1/4 cup all-purpose flour
1/2 teaspoon baking soda
1 cup chocolate chips
1/2 cup walnuts, coarsely chopped (optional)
Note: If using unsalted butter, add 1/4 teaspoon iodized salt into the flour mixture