01 -
Set oven temperature to 175°C (350°F).
02 -
In a saucepan over medium-high heat, bring chicken broth to a boil. Add wild rice, reduce heat to low, and simmer covered for 60 minutes. Remove from heat, fluff rice with a fork, and set aside.
03 -
Combine garlic powder, onion powder, salt, black pepper, and cayenne in a small bowl. Evenly coat both sides of chicken breasts with spice mixture. Heat olive oil in a skillet over medium-high heat; sear chicken until internal temperature reaches 74°C (165°F). Remove and shred chicken using two forks.
04 -
In the same skillet, melt butter over medium heat. Add chopped celery, onion, carrots, and mushrooms. Sauté until vegetables are fragrant and just tender, about 8 to 10 minutes.
05 -
In a large mixing bowl, combine sautéed vegetables, shredded chicken, cooked wild rice, cream of chicken soup, and sour cream. Mix thoroughly.
06 -
Transfer mixture to a greased 33 x 23 cm (13 x 9 in) baking dish. Bake uncovered for 25 minutes.
07 -
Remove dish from oven, sprinkle shredded Colby cheese over the top, and return to oven. Bake an additional 5 minutes or until cheese is melted.