Heat the olive oil in a large pot over medium-high heat. Add the shallots and garlic and cook until softened, about 5 minutes. Add the mussels, wine, cream, butter, and parsley and season well with salt. Give it a good stir, cover the pot, and cook until mussels open and are cooked through, about 10 to 15 minutes. Divide the mussels and the juices between 2 bowls and serve with the crusty bread.