In a large mixing bowl, cream the butter, peanut butter, and sugars. Add eggs, one at a time, beating well after each addition. Add vanilla. Combine the flour, baking soda and salt; add to creamed mixture and mix well. Add in chocolate chips.
Shape into balls (about 1 ½ tablespoon worth) and place about 2 inches apart on ungreased baking sheets. Bake at 375 degrees for 7 minutes or until golden. Remove to wire racks to cool.