Heat 1 tbsp butter or oil in a large pot. Add shallot and sauté on medium heat until aromatic, about 5 minutes.
Mix in chopped mushrooms and turn heat down slightly. Cover and cook until the mushrooms have softened a bit, about another 5 minutes.
Add your cut green beans, condensed soup, and seasonings. Stir and heat through.
Notes
Macronutrients: 32g carb, 19.5g fat, 10g protein
Feel free to swap a can of the cream of mushroom for a cream of chicken or celery. It will comes out creamy and delicious no matter what.
If you want more bulk to this soup, I suggest adding a few cups of chopped carrot and celery to the soup, as well as some kale. To do this, you'd cook the celery and carrots with the shallot, and add that kale when you add the green beans.
You can make this soup's broth as thin or thick as you'd like. If you're unsure how you want it, start by adding half the amount of milk and stirring more in as needed.