Preheat the oven to 350 F.
Cream the butter and the sugars with an electric mixer until light. Beat in the eggs, then the milk and the vanilla extract.
Stir the flour, baking soda, baking powder and salt together and gradually stir the flour mixture into the sugar mixture until it’s incorporated. Stir in the oats and chocolate chips.
Drop dough, making 1 inch rounds, onto the cookie sheet, placing about 1 1/2 inches apart so they have room to spread.
Bake on center rack for 10-13 minutes, until golden brown at the edges and light golden at the center.
Cool on baking sheet for at least 1-2 minutes before moving to a wire rack to cool completely.