Melt the butter in a large pot set over medium heat. Once melted, place the seasoned chicken in the pot and cook until it develops a golden crust on each side and reaches an internal temperature of 160°F (71°C).
Transfer the chicken to a cutting board and allow it to rest for five minutes.
To the same pot, add the mushrooms, onion, celery, and carrots. Sauté for approximately 5 to 7 minutes until softened, then stir in the garlic and cook until aromatic.
Pour in the chicken broth and half and half, whisking to incorporate and deglaze the pan by scraping up any browned bits. Increase the heat to medium-high to bring the mixture to a boil.
Chop the rested chicken into bite-sized pieces and return it to the pot. Stir in the salt, black pepper, garlic powder, thyme, sage, cayenne, and paprika.
Once the mixture is boiling, add the egg noodles. Reduce the heat to medium and simmer for 10 to 15 minutes.
Stir in the corn, peas, and parsley. Continue cooking until the pasta is tender and the sauce has thickened, about 6 to 8 minutes.
Remove from the heat and, if desired, top with pie crust crumbles before serving.