Preheat oven to 350 degrees F (175 degrees C). Lightly grease cookie sheets.
Cream butter and peanut butter together. Add the sugars and stir until well mixed.
Add eggs one at a time, then add vanilla.
Mix oatmeal and baking soda separately, then stir into batter.
Add chocolate chips last.
Drop by heaping teaspoons onto cookie sheets. Bake for 12-15 minutes.