4 boneless skinless chicken breasts, OR 4-6 boneless skinless chicken thighs
3 teaspoons Italian seasoning, divided
3 cups low sodium chicken broth
1 cup orzo pasta (see note)
4 tablespoons butter, melted
1 cup sliced mushrooms
1 medium white or yellow onion, finely chopped
2 teaspoons minced garlic
1 teaspoon salt (or to taste)
¼ teaspoon black pepper
½ cup shaved or finely shredded parmesan cheese
freshly cracked black pepper and herbs (such as thyme or parsley) for garnish