CAN BE MADE IN ADVANCE AND REHEATED: To reheat, simply cover the Pyrex in foil paper and reheat in a preheated oven to 320°F/160°C for 10 minutes
SUBSTITUTIONS: Feel free to swap the mozzarella for gruyère or any other cheese that melts well
ADDITIONS: Olives, sun-dried tomatoes, sautéed mushrooms...whatever your heart desires!