Vegetable oil cooking spray |
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1 tablespoon extra-virgin olive oil |
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4 ounces thinly sliced pancetta, diced into 1/2-inch pieces |
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1/4 teaspoon freshly ground black pepper |
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Two 1/2-to-3/4-inch-thick slices country-style bread, cut into 1/2-inch cubes (about 4 cups) |
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6 large eggs, beaten, at room temperature |
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2 packed cups chopped spinach |
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1 1/2 cups grated gruyere (6 ounces) |
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1/4 cup milk, at room temperature |
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Special equipment: four 10-ounce ramekins |
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