Gather all ingredients before starting recipe

Peel and chop 1/2 of a medium sized onion

Slice 8-10 medium to large cremini mushrooms

Melt 1 tablespoon of butter in a medium stock pot over medium heat

Add chopped onions and sauté until the onions become soft, about 5 minutes

Add thyme, salt, pepper, the second tablespoon of butter and the sliced mushrooms to onions and stir to combine. Sauté until the juices have all but evaporated and the mushrooms are beginning to brown, another 5-7 minutes.

Add the final tablespoon of butter, melt and then add 1/4 cup of flour. Stir to coat the mushrooms completely. Add chicken stock, and stir to combine. Bring the soup to a boil, then reduce heat and simmer for 10 minutes.

Add one half cup of heavy cream, taste and adjust seasoning if needed.