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1
Position oven rack in the center of oven; preheat oven to 400u00b0.
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2
Generously butter an 8-inch souffle dish; sprinkle lightly with cheese, shaking the dish to coat evenly.
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3
Heat the oil in a large nonstick skillet over medium heat.
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4
Add in mushrooms; cook, stirring, until they begin to release their moisture.
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5
Increase heat to med-high; saute until the moisture evaporates, about 5 minutes.
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6
Stir in the parsley, rosemary, thyme, and garlic; saute for 1 minute.
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7
Add 1 teaspoon salt and a generous grinding of pepper; set aside to cool.
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8
Melt the butter in a small saucepan over low heat; add in flour; cook, stirring constantly, for 3 minutes.
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9
Gradually whisk in milk; bring to a boil, stirring constantly.
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10
Cook, stirring constantly, for 3 minutes; add in remaining 1 teaspoon salt and a grinding of pepper; remove from heat.
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11
In a big bowl, whisk the egg yolks until blended; whisk in a little of the white sauce to temper the eggs, then add the remaining sauce, whisking until blended.
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12
Add in mushrooms and cheese; stir.
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13
Add egg whites to a large bowl, then add in cream of tartar; beat slowly with an electric mixer until soft peaks form.
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14
Increase speed to high and beat until peaks are stiff and smooth.
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15
Using a rubber spatula, transfer about 1/3 of the egg whites to the mushroom sauce and gently fold in until blended.
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16
Add the remaining egg white to the sauce and gently fold in until blended; pour into prepared dish.
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17
Put the souffle in the oven and decrease temperature to 375u00b0; bake until the souffle is puffed and golden, 30-35 minutes.
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18
If you like your souffle firm in the center, bake it for 5 minutes more; serve at once.
