Crock Pot Chicken Wild Rice Soup

I am trying SO hard to meal plan better and this is on the menu for tomorrow:

Crockpot Chicken Wild Rice Soup

Ingredients:
1 cup uncooked wild rice
1 pound chicken breasts
2 cups mirepoix (chopped celery, carrots, and onions)
6 cups chicken broth
1 teaspoon poultry seasoning
½ cup butter
¾ cup flour
2 cups whole milk
a few tablespoons white wine (optional)
up to 2 cups additional milk or water

Instructions
1. Rinse the wild rice. Place the uncooked wild rice, raw chicken, mirepoix, chicken broth, and poultry seasoning in a crockpot. Cover and cook on low for 7­8 hours. The chicken should be cooked through and the rice should be soft. There will be extra liquid in the crockpot; do not drain.
2. Remove the chicken breasts from the crockpot and allow to cool slightly. Using two forks, shred the chicken. Return the shredded chicken to the crockpot.
3. When rice and chicken are done cooking, melt the butter in a saucepan. Add the flour and let the mixture bubble for 1 minute. Slowly whisk in the whole milk until a thick, creamy mixture forms. Stir in the wine.
4. Add this to the rice and chicken in the crockpot and stir

Source: http://pinchofyum.com/crockpot-chicken-wild-rice-soup