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1
Whisk the egg yolks and 1/2 cup milk in a small bowl and set aside.
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2
Combine the remaining 1 cup milk and 1 cup cream in a medium saucepan; stir in the nutmeg, 1 teaspoon salt and 1/2 teaspoon pepper.
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3
Add the garlic and bay leaves and bring to a boil over medium heat.
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4
Reduce the heat to medium low; add the potatoes and simmer until halfway cooked, about 6 minutes.
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5
Remove from the heat.
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6
Gradually stir in the egg-milk mixture and 1 cup gruyere.
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7
Cover and keep warm.
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8
Preheat the broiler.
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9
Put the tomatoes, bell peppers and onion on a baking sheet in separate piles.
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10
Drizzle each pile with 2 teaspoons olive oil and sprinkle each with 1 teaspoon herbes de Provence, and salt and pepper to taste.
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11
Toss each pile of vegetables to coat, then spread out the piles.
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12
Broil until tender and charred around the edges, about 10 minutes.
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13
Preheat the oven to 375 degrees F. Brush a 1 1/2-quart baking dish with olive oil.
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14
Sprinkle half of the breadcrumbs (1/2 cup plus 2 tablespoons) in the dish.
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15
Spoon out half of the potatoes and arrange evenly over the breadcrumbs; top with the broiled onions and half each of the tomatoes and bell peppers.
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16
Top with the remaining potatoes in an even layer and all of the cream mixture; discard the garlic and bay leaves.
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17
Top with the remaining tomatoes and bell peppers.
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18
Bake until the potatoes are tender and lightly golden, 40 to 50 minutes.
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19
Drizzle with the remaining 1/2 cup cream and sprinkle with the remaining 1/2 cup plus 2 tablespoons breadcrumbs and 1/2 cup gruyere.
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20
Continue baking until the cheese melts, about 5 more minutes.
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21
Let rest 10 minutes before serving.
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22
Photograph by Kana Okada