Heat a large pot of water over high heat. Prepare an ice bath in a large bowl.
Cut the stems out of the tomatoes and score an “X” on the bottom of each with a paring knife (you only want to pierce the skin and not too much of the flesh).
When water boils, add tomatoes (working in batches as needed) and boil for about 1 minute or until tomato skin begins to separate from flesh. Smaller tomatoes may need less time. Remove with a slotted spoon to the ice bath.
Once tomatoes have cooled, remove them from the ice bath and peel off the skin with you hands and discard it.
In the pot of a slow cooker, combine peeled tomatoes with all the other ingredients (including the corn cob, but excluding the feta cheese, leafy herbs, and cornbread). Stir until ingredients are evenly distributed.
Cook on low for 8-10 hours or on high for 4-6 hours.
Stir chili and divide into bowls. Top with feta cheese and leafy herbs. Serve with cornbread if desired.