French onion soup with mushrooms

Ingredients:

• 2 tbsp (30 g) butter
• 1 cup (90 g) chopped mixed mushrooms (champignons, shiitake, oyster mushrooms)
• 1 cup (130 g) onion, thinly sliced
• 1 tbsp flour
• 2 tbsp. 35% cream
• 2 cups (500 ml) beef broth

To prepare croutons:

• 4 slices (1 cm thick) French baguette
• 1/2 cup (85 g) grated Gruyere cheese
• 2 tbsp. crumbled blue cheese
• 1 tbsp chopped fresh green onions

Preparation:

1. Melt the butter in a saucepan over medium heat, add the onion and mushrooms, and sauté for 10-12 minutes, until caramelized. Finally, add the flour, slowly whisking in the cream. Increase the heat slightly, add the beef broth, and bring the mixture to a boil. Then, reduce the heat and simmer for 20 minutes, stirring occasionally.
2. Preheat the oven to 400°F. Lightly toast the bread slices in the oven and set aside.
3. Pour out onion soup puree into ceramic bowls, placing 2 slices of fried bread on top.
   Sprinkle with Gruyere and blue cheeses and bake in the oven for 2 minutes, until the cheese is melted.
4. Serve hot, sprinkled with fresh green onions.