Lightning fast spinach gratin with parmesan

The term gratin refers to a dish that is cooked and gratinated in the oven. Vegetables that can be cut into thin slices, such as potatoes or zucchini, are particularly suitable for a hearty gratin. But today we prepared a variant with spinach and mushrooms. Our spinach gratin with parmesan from the oven tastes delicious and is quick to prepare. It is perfect as an accompaniment to meat and fish dishes.