Cheesy Cauliflower Gratin with Crispy Panko Topping

This crowd-pleasing, comforting gratin features a mix of pungent cheeses that pair well with the mild sweetness of the cauliflower. Butter richens the flavor and the golden, crunchy topping offers the perfect textural contrast to its creamy, saucy filling. For the cheese sauce, start with warm milk to help it thicken quickly. Cook the sauce…