In a large saucepan, over medium heat, melt 3 tablespoons of butter.
Add the garlic and sauté for 1 minute.
Add the shallots, bay leaves and thyme. Let sweat but add no coloration, about 2 minutes.
Deglaze the pan with the white wine and bring to a boil for 2 minutes.
Add the mussels. Cover the saucepan to steam the mussels. Cook the mussels until they are all open, about 2 minutes.
Remove the lid, and add the crème fraîche and stir to combine.
Add the chili flakes, black pepper, salt and remaining butter.
Garnish with parsley and serve immediately.