Chicken and Vegetable Tortellini Soup

lbs boneless/skinless chicken, cooked and shredded

onion, chopped

garlic cloves, chopped

chicken broth

carrots, peeled and thinly sliced

stalks celery, thinly sliced

TB oregano

diced tomatoes, drained

frozen tortellini

small bunch fresh kale, washed and roughly cut up

salt and pepper