1. Prepare the Baguette

• Preheat your oven to 180°C (350°F).
• Slice the baguette into sandwich-sized pieces, then cut each piece in half lengthwise.
• Brush the cut sides of the baguette with olive oil and sprinkle with a pinch of salt.
• Place the baguette halves on a baking sheet and toast in the oven for 5–7 minutes, or until golden and crispy.

2. Make the Mushroom Filling

• Heat a drizzle of olive oil in a large skillet over medium heat.
• Add the finely chopped onion and sauté until soft and translucent, about 3–4 minutes.
• Add the sliced mushrooms and cook until they release their moisture and start to brown, about 6–8 minutes.
• Stir in the butter, thyme, salt, black pepper, and minced garlic. Cook for another 2–3 minutes until the mushrooms are fully cooked and fragrant.
• Remove the skillet from heat and set aside the mushroom filling.

3. Assemble the Sandwiches

• Spread the mushroom filling evenly on the bottom halves of the toasted baguette pieces.
• Sprinkle grated cheese generously over the mushrooms.
• Layer the tomato slices on top of the cheese, then season with a pinch of salt, oregano, and basil.
• Place the top halves of the baguette on the sandwiches.

4. Final Toast

• Return the assembled sandwiches to the baking sheet.
• Bake for 5–7 minutes, or until the cheese is melted and bubbly.

5. Serve

• Remove the sandwiches from the oven and let them cool slightly before serving.
• Serve warm and enjoy these crispy, cheesy, and flavorful mushroom sandwiches!