This cauliflower and potato casserole is a popular recipe that is both hearty and satisfying. It is made with roasted cauliflower, potatoes, onions, garlic, and a creamy sauce. The cauliflower and potatoes are roasted until tender and then combined with the sauce. The casserole is then baked until it is hot and bubbly. The combination of the roasted cauliflower, the creamy sauce, and the tender potatoes creates a flavorful and comforting dish that is perfect for a cozy dinner or a potluck gathering. Serve it as a main course with a side of crusty bread or as a side dish alongside roasted chicken or grilled fish.