1 tbsp. cornstarch
2 tbsp. cold water
3 c. chicken broth (or bouillon cubes)
1 egg

Bring broth to a boil. Measure the water and cornstarch in a jar. Shake until mixed. Pour the cornstarch mixture gradually into the broth, stirring with a fork. In a small bowl, beat the egg. Slowly pour the beaten egg into the broth. Stir until egg is all stirred in, then cook 3 minutes more.