Heat butter in a soup pot over medium heat. Add onions, celery, and carrots, cook for 10 minutes, until onions have browned. Add garlic, ginger, turmeric, paprika, salt, pepper and thyme. Cook for another 5 minutes.
Add all remaining ingredients to the pot except for the pasta and miso (including the raw chicken). Bring to a boil, then reduce heat to a simmer. Cook for 20–30 minutes.
Remove the chicken from the pot and transfer to a bowl. If you’re unsure whether the chicken is fully cooked, check with a thermometer — it should read 165°F. Shred the chicken using two forks or stand/hand mixer.
Turn off the heat. Add the shredded chicken back to the pot along with the cooked pasta and miso mixture. Stir to combine.
Divide into bowls, and serve warm. I topped mine with some shaved parmesan, chopped parsley, chili flakes and a drizzle of olive oil, but this is optional.