In a large skillet add oil and cook celery and onion on medium-low heat until tender, about 4 minutes. Combine in a large mixing bowl cornbread crumbs, black pepper and salt. Add all remaining ingredients to cornbread mixture, stir well.
Lightly spray the inside of slow cooker with non-stick cooking spray. Add cornbread mixture and spread evenly. Cover and cook on low 4 hours.
For additional browning, pre-heat oven to broil, use oven mitts and remove, oven safe, slow cooker insert, place on the middle oven rack. Broil 5 - 8 minutes or until desired color is reached.