A comforting bake of butter-sautéed mushrooms in a creamy sauce topped with melted mozzarella cheese, perfect as a vegetarian main, side dish, or topping.
For extra golden crust, save about 1/4 cup of mozzarella to sprinkle on during the last 5 minutes of baking., Mixing mushroom varieties like cremini, button, and shiitake adds depth of flavor and texture., Bring whipping cream to room temperature to prevent curdling when added to hot mushrooms., Cook mushrooms without crowding the pan to ensure caramelization rather than steaming., Can be made up to 24 hours ahead by preparing the mushroom mixture and keeping mozzarella separate in the fridge., Leftovers keep well refrigerated for up to 4 days and freeze for up to 2 months., To reheat, warm covered with foil in a 325°F oven or microwave with a splash of cream; add extra mozzarella for freshness if desired., Substitutions and add-ins: use different cheeses (cheddar, fontina, gruyère), fresh herbs (thyme, rosemary), extra vegetables (onions, bell peppers, spinach), or proteins (cooked chicken, bacon)., Dairy-free swaps include olive oil for butter, coconut cream for whipping cream, and dairy-free mozzarella cheese.