Combine butter, sugar, and brown sugar with a spoon or an electric mixer on medium speed. Mix until light and fluffy. Mix in egg and vanilla. Stir in flour, baking soda, and salt. Stir in chocolate chips and nuts.
*I recommend mini chocolate chips if you're using the mini skillets.
**The simplest way to divide the dough evenly is to press it down lightly to fill your mixing bowl evenly. Then, use a spoon or spatula to divide it into quarters. No scale necessary!
Recipe slightly adapted from Everyday Food.