Vegetarian French Onion Soup with Mushrooms Recipe

Ingredients For Vegetarian French Onion Soup with Mushrooms Recipe

• 0.75 stick Unsalted butter
• 2 Large onions, peeled, halved, and thinly sliced
• 2 bunch Scallions, white and light green parts coarsely chopped, dark green tops thinly sliced
• 4 sprig Thyme, plus leaves for serving
• 1 Dried bay leaf
• 12 ounce Cremini mushrooms, coarsely chopped
• Coarse salt and freshly ground pepper
• 1.25 inch 4 thick slices sourdough bread
• 1.5 cup Shredded gruyere