Season both sides of chicken with salt, pepper, and Italian seasoning. Heat olive oil in a 4 1/2-quart soup pot over medium-high heat. Add chicken and cook for 3-4 minutes per side until golden brown. Remove and set aside.
Let chicken rest for 10 minutes, then use 2 forks to shred into bite-sized pieces.
Combine dried basil, parsley, oregano, mustard powder, sage, and pepper in a small bowl. Set aside.
Melt butter in the same pot and scrape up browned bits. Add diced onions, carrots, and celery. Cook for 5 minutes until softened.
Add minced garlic, Worcestershire sauce, hot sauce, and seasoning blend. Cook for 1 minute until fragrant.
Add chicken broth and shredded chicken. Bring to a gentle simmer, partially cover, and cook for 15 minutes.
Add refrigerated tortellini and simmer until cooked through, about 3 minutes for Rana brand or according to package directions.
Taste and adjust seasonings, adding up to 1/2 teaspoon salt if needed. Serve hot.
Notes
Searing the chicken is optional but adds rich flavor to the broth. If using bone-in chicken and the center isn’t fully cooked after searing, it will finish cooking in the broth.
Use low-sodium chicken broth to control salt content. You can always add more salt at the end.
Don’t overcook the tortellini or it will become mushy. Add it at the end and watch timing carefully.
Store leftovers separately from tortellini for best texture, or add extra broth when reheating as pasta absorbs liquid.