Preheat oven to 400°F with rack in middle.
Trim 1/4 inch from tops of whole heads of garlic, then put heads on a large sheet of foil and drizzle each with 1 teaspoon oil. Wrap heads together in foil and roast until very tender, 50 minutes to 1 hour. Cool to warm, then squeeze garlic from skins.
Meanwhile, bring milk, smashed garlic cloves, onion, thyme sprigs, bay leaf, clove, and peppercorns just to a boil in a medium saucepan, then remove from heat and cover. Let steep 30 minutes.
Butter a 12-inch oval (2-quart) gratin dish with 1 tablespoon butter, then sprinkle bottom and side with bread crumbs and chill until ready to use.
Melt remaining 6 tablespoons butter in a heavy medium saucepan and whisk in flour. Cook roux over low heat, whisking constantly, 5 minutes.
Strain milk mixture through a fine-mesh sieve, then add to roux, whisking until smooth. Bring to a boil, whisking, then simmer béchamel, whisking, 3 minutes. Remove from heat and vigorously whisk in yolks 1 at a time. Whisk in roasted garlic, parmesan, nutmeg, 3/4 teaspoon salt, and 1/4 teaspoon pepper and transfer to a bowl.
Beat egg whites with a pinch of salt using an electric mixer until they just hold stiff peaks, then stir one third of egg whites into yolk mixture. Fold in Gruyère, then remaining whites. Transfer mixture to gratin dish, smoothing top, and sprinkle with thyme leaves.
Bake soufflé until set and browned on top, 20 to 25 minutes.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	267.64 Kcal (1121 kJ)
Calories from fat	176.83 Kcal
		% Daily Value*
Total Fat	19.65g	30%
Cholesterol	138.64mg	46%
Sodium	167.54mg	7%
Potassium	196.03mg	4%
Total Carbs	10.39g	3%
Sugars	4.49g	18%
Dietary Fiber	0.54g	2%
Protein	12.18g	24%
Vitamin C	1.5mg	2%
Vitamin A	0.1mg	4%
Iron	0.7mg	4%
Calcium	191mg	19%

Amount Per 100 g
Calories	172.96 Kcal (724 kJ)
Calories from fat	114.27 Kcal
		% Daily Value*
Total Fat	12.7g	30%
Cholesterol	89.6mg	46%
Sodium	108.27mg	7%
Potassium	126.68mg	4%
Total Carbs	6.71g	3%
Sugars	2.9g	18%
Dietary Fiber	0.35g	2%
Protein	7.87g	24%
Vitamin C	1mg	2%
Vitamin A	0.1mg	4%
Iron	0.4mg	4%
Calcium	123.4mg	19%

* 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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