In a large pot melt 2 tablespoons of butter over medium heat. Add onions, carrots, celery and garlic. Sauté until translucent, about 5 minutes.
Next add the kale, mushrooms, and sweet potatoes. Cook another 2-3 minutes until veggies begin to soften.
Melt an extra tablespoon of butter and stir in flour until veggies are coated. Slowly pour in the chicken broth.
Add wild rice, oregano, thyme, salt and pepper. Bring to a boil and then reduce to a simmer for 20-25 minutes until the rice and sweet potatoes are fully cooked.
For a creamier texture, add 1/2(ish) cup of milk, almond milk, or half and half.
Optional: for a thicker soup you could also add a can of cream of mushroom soup.