Preheat oven to 375 degrees F (190 degrees C).
In a large bowl, cream together the butter, peanut butter, brown sugar, and white sugar until smooth.
Beat in the eggs one at a time, then stir in the corn syrup, water, and vanilla.
Combine the flour, baking soda, and salt; stir into the peanut butter mixture.
Fold in chocolate chunks.
Drop by 1/4 cupfuls 3 inches apart onto ungreased baking sheets
Bake for 12 to 14 minutes in the preheated oven, or until edges are golden. Allow cookies to cool for 1 minute on the cookie sheet before removing to wire racks to cool completely.