Aunt Clara used to make this simple appetizer for Sunday dinners. Just 3 ingredients for warm, bubbly perfection that melts in your mouth.

If you’d like a little more flavor but still want to keep the spirit of Aunt Clara’s three-ingredient dish, choose a more assertive white cheese such as provolone or a mild white cheddar in place of some or all of the mozzarella. For a slightly smoky taste, use a smoked mozzarella or smoked provolone. You can also change the character of the dish by using different tomatoes: grape tomatoes will hold their shape better, while mixed-color cherry tomatoes make a pretty presentation. If strict low carb isn’t a concern, this same method works nicely spooned over toasted bread as a rustic bruschetta topping. To keep prep even easier for busy days, assemble the tomatoes and oil in the dish a few hours ahead, cover, and refrigerate; add the cheese just before baking so it melts and browns properly. Leftovers can be gently reheated in a small baking dish or skillet the next day and served over cooked chicken or zucchini noodles for a quick, low-carb lunch.