In a medium bowl, combine the sun-dried tomatoes, mushrooms, Parmesan cheese, cream of mushroom, cream of celery, and all seasonings (salt, pepper, oregano, rosemary, sage, and garlic powder). Mix well and set aside.
Assemble in Skillet:
In a large oven-safe skillet or cast iron pan, evenly spread the uncooked wild rice across the bottom.
Arrange the chicken thighs on top of the rice in a single layer, avoiding overlap.
Add the Creamy Mixture:
Spoon the prepared mushroom mixture evenly over the chicken and rice. Use the back of your spoon to gently press and create small pockets throughout the mixture.
Add Broth:
Slowly pour the chicken stock or broth over the top, allowing it to settle into the mixture and rice.
Bake:
Cover the skillet tightly with a lid or foil and bake in the preheated oven for 45 minutes to 1 hour, or until the chicken is fully cooked and the rice is tender.
Serve:
Serve hot, straight from the skillet. Garnish with fresh herbs or extra Parmesan if desired.