Place vegetable oil in a saucepan. Add in the onion, celery, salt and pepper and saute until softened, 5-7 minutes. Stir in garlic and cook for 30 seconds.
Remove the onions and set aside. In the same pan, heat a tablespoon of butter over medium heat and add the cubed apples and sauté.
Combine the cooked apples and wild rice blend in the large bowl and add all the rest of the ingredients. Give it a toss.
Transfer the wild rice and veggie mixture to a prepared oven proof casserole dish and warm in the preheated 325 F. oven for 20-25 minutes.