In a large saucepan, bring 3 cups of water to a boil (you need to measure the water, since it forms part of the broth!) along with garlic. Add tortellini and cook according to package instructions (usually about 10 minutes).
Lower temperature to medium-high. Add chicken or turkey broth, stir. Add corn and stir. Bring up to a boil again, and boil for 2-3 minutes. Add chicken and cook for 1 more minute, stirring well. Add green onions and pepper, stir well.
Allow to cool to room temperature, then divide into equal portions in containers. Freeze.