Place chicken in the bottom of the slow cooker. In a microwave safe bowl, combine the onion, carrot, celery, garlic, oregano, basil, parsley and olive oil. Microwave on high for 5 minutes, stirring halfway through. Add concoction to the slow cooker. Add in the bay leaf, pepper, salt, and chicken broth. Cover and cook on LOW for 4 hours, or until chicken is tender. Alternately, you can also cook on HIGH for about 2-3 hours. (I do feel that chicken turns out better in the slow cooker when cooked on low though). Remove chicken and place on a cutting board. Turn the slow cooker to high. Mix 3 Tbsp of cornstarch with an equal amount of water and stir together until smooth. Stir into the slow cooker and keep the lid off. Go back to the chicken and slice it into bite size pieces or shred it. Add the chicken back into the slow cooker. Warm the half and half (or else it will curdle) and add it into the slow cooker. I always just stick mine in the microwave for a couple of minutes. Add the bacon bits, gnocchi and kale into the slow cooker and give a little stir. Let it cook on high for 10 minutes. Ladle into serving bowls and top each serving with a tablespoon of Parmesan cheese.