Preparation Melt butter in large pot over medium-high heat. Add onions; sauté until golden, about 5 minutes. Add all mushrooms and thyme; sauté until mushrooms begin to brown, about 8 minutes. Add brandy; stir 30 seconds, then mix in flour. Slowly stir in broth; bring soup to boil. Reduce heat; simmer uncovered 10 minutes. Season with salt and pepper. Ladle into bowls.
Preparation Melt butter in large pot over medium-high heat. Add onions; sauté until golden, about 5 minutes. Add all mushrooms and thyme; sauté until mushrooms begin to brown, about 8 minutes. Add brandy; stir 30 seconds, then mix in flour. Slowly stir in broth; bring soup to boil. Reduce heat; simmer uncovered 10 minutes. Season with salt and pepper. Ladle into bowls.