Preheat the oven to 375°. In a 9-inch cake pan, drizzle the garlic with the oil. Cover with foil and roast for 40 minutes, until tender. Let cool, then squeeze out the cloves.
Mash the garlic to a paste and transfer to a saucepan. Add the half-and-half, thyme and rosemary and bring to a boil. Simmer over very low heat until reduced to 3 cups, 20 minutes; season with salt and pepper.
Arrange one-fourth of the potatoes in the bottom of a 9-by-13-inch baking dish. Top with one-fourth of the shredded cheeses and drizzle lightly with the garlic cream. Repeat the layering with the remaining potatoes, cheese and cream. Pour any remaining cream on top and press the top layer of potatoes to submerge it.
Bake the gratin for about 1 1/2 hours, until golden and bubbling. Let cool for 20 minutes before cutting into squares and serving.
MAKE AHEAD The gratin can be prepared through Step 3; refrigerate overnight. Return to room temperature before baking.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	583.88 Kcal (2445 kJ)
Calories from fat	293.52 Kcal
		% Daily Value*
Total Fat	32.61g	50%
Cholesterol	98.98mg	33%
Sodium	388.35mg	16%
Potassium	1369.88mg	29%
Total Carbs	56.41g	19%
Sugars	3.19g	13%
Dietary Fiber	2.9g	12%
Protein	21.74g	43%
Vitamin C	52.8mg	88%
Iron	229.6mg	1276%
Calcium	634.2mg	63%

Amount Per 100 g
Calories	127.94 Kcal (536 kJ)
Calories from fat	64.32 Kcal
		% Daily Value*
Total Fat	7.15g	50%
Cholesterol	21.69mg	33%
Sodium	85.1mg	16%
Potassium	300.18mg	29%
Total Carbs	12.36g	19%
Sugars	0.7g	13%
Dietary Fiber	0.63g	12%
Protein	4.76g	43%
Vitamin C	11.6mg	88%
Iron	50.3mg	1276%
Calcium	139mg	63%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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