Super-easy chicken noodle soup

Instructions

1. Melt the butter in a large stockpot over medium-low heat. Add the onion and 1/2 tsp salt; cook, stirring often, until the onion is soft and translucent, about 10 minutes.
2. Add the broth and increase the heat to high; bring to a boil. Stir in the pasta, frozen vegetables, and tomatoes; cook until the pasta is done, about 7 minutes.
3. Stir in the chicken, cheese, lemon juice, remaining 1 tsp salt, pepper, and chives; cook for 1 more minute to heat through.
4. Serving size: about 1 1/2 cups