Heat the coconut oil in a large skillet on medium high heat.
Finely chop the mushrooms and dice the onion.
Once the pan is hot, add the chopped mushrooms and diced onions and sauté until they're soft, about 8 minutes.
Using a garlic press, add the garlic to the skillet and cook for about 30 seconds until the garlic is fragrant.
Turn the skillet down to low and add the cream, broth, and flour, and quickly whisk to combine.
Bring the ingredients to a slow simmer and cook for 5 minutes on low heat, whisking constantly to avoid lumps.
Season with salt and pepper to taste.