Add boiling water to the dry mushrooms and let them soak for at least 10 minutes.
Strain through a fine sieve lined with a paper towel reserving all of the liquid. Rinse the mushrooms to get rid of any grit and then chop them finely. Set aside
Add 1 tbsp of butter to a large pot and sauté onion and garlic until softened, about 5 minutes.
Add another tablespoon of butter, the chopped cremini mushrooms, salt, pepper and herbs de Provence and sauté for about 10 minutes until mushrooms are softened.
Add the remaining 2 tablespoons of butter and when it has melted sprinkle the flour into pot. Stir to incorporate for a minute.
Add broth, wine, Worcestershire and all of the reserved liquid to the mushroom mixture and continue to stir until soup comes to a boil. Reduce to low and simmer for about 15 minutes. Add cream and salt to taste and simmer for 10 more minutes.