LORELAI: Sookie, listen, you hired Bob. You trained him in your image.
A reference to the Bible. In Genesis 1:27, it says, “So God created man in his own image, in the image of God he created him; male and female he created them.” Lorelai is humorously suggesting that Sookie is the “god” of the kitchen who has trained Bob as her “creation”.
The Annotated Gilmore Girls 