Mushroom bisque is full of cream and garlic-infused mushrooms, all blended to make a thick, rich, and beyond flavorful soup! You will want to drink this straight from your bowl!
Add the butter to a 6 or 8-quart Dutch oven and melt over medium heat. Once the butter is melted, add the mushrooms. Cook and stir the mushrooms for about 5 minutes until they have released a lot of liquid. Turn the heat to medium-low and cook for an additional 10-15 minutes until the liquid has almost entirely evaporated.
Add the onions, garlic, thyme, and parsley and cook for 2-3 minutes, until the onions start turning translucent and the garlic is fragrant.
Turn the heat back up to medium and stir in the flour. Continue to stir as you cook the flour with the mushroom mixture for 3-4 minutes. It will get clumpy and stick together, which is alright.
Slowly stir in the broth, ensuring the mixture doesn’t clump up too much as you add it.
Add the cream and stir until combined.
Carefully ladle the soup into a high-speed blender. Place a clean, folded kitchen towel on top to prevent leaking, and then blend the soup on high speed until smooth. This may be split into a few increments if your blender is not big enough for all of the soup at one time.
Add the pureed soup back to the pot and simmer over medium-low heat, while stirring intermittently for about 10 minutes until thickened. Season with salt and pepper to taste. Serve warm.