Bring a large pot of salted water to a boil. Add potatoes and cook, removing when not quite tender, 25 to 30 minutes. Drain and set aside until potatoes are cool enough to handle.
In a small skillet, melt 1 Tbsp. butter over medium heat. Add onion and cook, stirring occasionally, until tender, about 6 minutes. Add garlic and cook, stirring, until fragrant, about 2 minutes longer. Transfer to a medium bowl and let cool.
Preheat oven to 350ºF and line a large baking sheet with foil. Generously butter a 9-by-13-inch baking dish and place it on lined baking sheet. Add Gruyère, Cheddar, Parmesan, thyme, 2 tsp. salt and 1 tsp. pepper to onion mixture and stir until well combined.
Peel and slice potatoes 1/4-inch thick. Arrange 1/3 of potatoes in baking dish, overlapping where necessary, and sprinkle with 1/3 of cheese mixture. Repeat layering twice, finishing with cheese. Pour cream over all potatoes and press bay leaves on top. Bake until cream is mostly absorbed and top is golden brown and bubbling, about 1 hour 15 minutes. Remove bay leaves. Let cool for 10 minutes and serve.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	4069.95 Kcal (17040 kJ)
Calories from fat	2052.24 Kcal
		% Daily Value*
Total Fat	228.03g	351%
Cholesterol	774.82mg	258%
Sodium	2821.75mg	118%
Potassium	771.23mg	16%
Total Carbs	351.21g	117%
Sugars	6.91g	28%
Dietary Fiber	39.05g	156%
Protein	160.51g	321%
Vitamin C	16mg	27%
Vitamin A	0.1mg	5%
Iron	3.2mg	18%
Calcium	4419.8mg	442%

Amount Per 100 g
Calories	157.29 Kcal (659 kJ)
Calories from fat	79.31 Kcal
		% Daily Value*
Total Fat	8.81g	351%
Cholesterol	29.95mg	258%
Sodium	109.05mg	118%
Potassium	29.81mg	16%
Total Carbs	13.57g	117%
Sugars	0.27g	28%
Dietary Fiber	1.51g	156%
Protein	6.2g	321%
Vitamin C	0.6mg	27%
Iron	0.1mg	18%
Calcium	170.8mg	442%

* 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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