Preheat the oven to 400 degrees with the rack in the upper half of the oven.
Thinly slice the potatoes about 1/8 inch on a mandolin, food processor, or the old fashioned way, a sharp knife .
Melt the butter in a large sauté pan over high heat and add the shallots and sliced mushrooms and cook for about 6 to 8 minutes.
Add the re-hydrated porcinis to the pan (if using) and sauté until the liquid from the mushrooms has evaporated.
Season the mushrooms with salt and pepper.
Add the chicken stock, 1 1/4 cup of the cream, and chopped herbs, heat through, do not boil.
Use an oiled 3-quart baking dish.
Begin with a layer of about 1/3 of the potatoes, 1/2 of the mushrooms and cream and a little of each cheese, 1/3 of the potatoes, the remaining 1/2 of the mushrooms with cream, then the final layer of potatoes.
Pour the remaining 1/2 cup cream over the potato layers and top with the remainder of the cheeses.
Cover with foil.
Bake until the potatoes are tender and the cream is almost completely set and thickened, about 1 1/2 hours.
Uncover and top with breadcrumbs and cook until golden, about 15 minutes.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	462.81 Kcal (1938 kJ)
Calories from fat	236.89 Kcal
		% Daily Value*
Total Fat	26.32g	40%
Cholesterol	84.97mg	28%
Sodium	374.07mg	16%
Potassium	797.58mg	17%
Total Carbs	38.32g	13%
Sugars	4.88g	20%
Dietary Fiber	4.2g	17%
Protein	20.32g	41%
Vitamin C	22.6mg	38%
Iron	92.4mg	513%
Calcium	463.2mg	46%

Amount Per 100 g
Calories	151.2 Kcal (633 kJ)
Calories from fat	77.39 Kcal
		% Daily Value*
Total Fat	8.6g	40%
Cholesterol	27.76mg	28%
Sodium	122.21mg	16%
Potassium	260.57mg	17%
Total Carbs	12.52g	13%
Sugars	1.6g	20%
Dietary Fiber	1.37g	17%
Protein	6.64g	41%
Vitamin C	7.4mg	38%
Iron	30.2mg	513%
Calcium	151.3mg	46%

* 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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