1

Adjust oven rack to middle position and heat oven to 350°F. Use cut side of halved garlic to rub sides and bottom of 2-quart shallow baking or gratin dish. Allow garlic in dish to dry briefly, about 2 minutes, then coat dish with softened butter. Combine cheeses in small bowl.

2

Bring minced garlic, cream, broth, thyme, nutmeg, salt and pepper to boil in large saucepan over medium-high heat. Reduce heat to medium-low and simmer until liquid is reduced to 2½ cups, about 5 minutes. Remove from heat and gently stir in potatoes.

3

Spoon half of potato mixture into prepared dish. Sprinkle with half of cheese, add remaining potato mixture, and press with spatula to compact. Press bread pieces into top of casserole.

4

Bake 40 minutes. Sprinkle remaining cheese on top and continue baking until golden and bubbling, 25 to 30 minutes. Remove from oven and let rest 20 minutes before serving.