In a medium microwave-safe bowl, add onions and red/yellow peppers. Cook for 4-5 minutes, to soften.
In a large nonstick pan add onions/peppers, quinoa, chicken broth, tomatoes, and taco seasoning. Mix well to combine. Bring to a boil. Reduce heat, cover, and simmer until the liquid is absorbed and the quinoa is cooked about 15 minutes.
Stir in black beans and chicken. Cook an additional 5 minutes.