- Heat oven to 350 while mixing sugars, butter, vanilla, and egg. 
- Stir in flour and baking soda, then add chocolate chips. 
- Spread dough in a 10 1/2" cast iron griddle pan. (Use a paper towel to rub pan in thin layer of shortening if pan is not well seasoned.) 
- Bake 15-20 minutes, or until center seems done.