Preheat oven to 375 degrees
In a large bowl, beat butter and both sugar until creamy. Add eggs, milk, and vanilla. Mix well.
In a small bowl mix together flour, baking soda and salt. Then add to the wet ingredients and mix well.
Add oats and chocolate chips. Mix well.
Drop rounded tablespoons of dough onto ungreased cookie sheets
Bake 9-10 minutes for chewy cookies. Cool 1 minute on cookie sheet, then transfer to a cooling rack and cool completely.