It was the first time I had eaten this kind of dish and it was incredibly delicious!

Preparation of pasta gratin with sausage and mushrooms in the oven:
Step 1: Preparing and cooking the pasta: Preheat your oven to 190°C (375°F). Cook the pasta al dente according to the package instructions. Drain and set aside.
Step 2: Cooking the sausage and vegetables: In a large skillet, heat the olive oil over medium heat. Add the sliced ​​Italian sausage and brown it. Remove the sausage and set it aside. In the same skillet, add the sliced ​​onion and sauté until golden. Add the garlic and sliced ​​mushrooms, and cook until the mushrooms are tender.
Step 3: