Heat 1/4 cup oil in large skillet over medium-high heat. Add leeks; sauté until soft and lightly browned, 10 to 12 minutes. Add mushrooms, sprinkle with salt and pepper, and sauté until soft and liquid evaporates, 7 to 8 minutes. Add garlic; sauté 1 minute. Season with salt and pepper. Set aside. DO AHEAD Can be made 4 hours ahead. Let stand at room temperature.
Preheat oven to 375°F Pat potato slices dry with kitchen towel. Combine cream, 1 teaspoon salt, and 1/2 teaspoon pepper in large pot. Add potatoes. Bring to boil; reduce heat to medium and simmer, covered, 10 minutes, stirring occasionally. Remove lid; simmer until cream is reduced by about half and potatoes are partially cooked, stirring often and watching closely to prevent mixture from burning, about 3 minutes. Season with salt and pepper.
Brush 13x9x2-inch glass or ceramic baking dish with oil. Transfer half of potato mixture to dish, spreading out in even layer. Spoon mushroom mixture over in even layer. Spoon remaining potato mixture over, spreading in even layer. Sprinkle cheese over. Cover with foil, tenting in center to prevent cheese from sticking to foil. Bake 30 minutes. Uncover; bake until potatoes are tender and top is brown, 20 to 25 minutes longer. Let rest 10 minutes before serving.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	325.32 Kcal (1362 kJ)
Calories from fat	168.38 Kcal
		% Daily Value*
Total Fat	18.71g	29%
Cholesterol	47.4mg	16%
Sodium	296.67mg	12%
Potassium	883.12mg	19%
Total Carbs	32.51g	11%
Sugars	4.15g	17%
Dietary Fiber	2.79g	11%
Protein	9.96g	20%
Vitamin C	30.5mg	51%
Iron	111.6mg	620%
Calcium	192.9mg	19%

Amount Per 100 g
Calories	114.64 Kcal (480 kJ)
Calories from fat	59.33 Kcal
		% Daily Value*
Total Fat	6.59g	29%
Cholesterol	16.7mg	16%
Sodium	104.54mg	12%
Potassium	311.19mg	19%
Total Carbs	11.45g	11%
Sugars	1.46g	17%
Dietary Fiber	0.98g	11%
Protein	3.51g	20%
Vitamin C	10.8mg	51%
Iron	39.3mg	620%
Calcium	68mg	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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