Freezer Meal Wild Rice Soup

cups mirepoix, fresh or frozen

ounces mushrooms, fresh or frozen

cloves garlic, minced

cup uncooked wild rice (the REAL stuff, not a blend)

vegetable or chicken broth

teaspoon salt

teaspoon poultry seasoning (or spices like sage, thyme, and rosemary)

lb. chicken breasts (optional)

tablespoons butter

cup flour

cups whole milk