- Preheat the oven to 190°C (375° F).
- Heat a pan to medium-high, pour in a drizzle of olive oil and cook the mushrooms and the pepper for 2 minutes. Mix in the garlic and the pepper and set aside.
- Cut the paninis in half and brush the inside with tomato sauce.
- Distribute the vegetable mix, the sausage slices, the cheeses and the herbs. Close the paninis, brush the outside with olive oil and cook in a panini press or in the oven until the cheese is melted.