INGREDIENTS
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Butter, for greasing pan
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1 tablespoon olive oil
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1 pound hot Italian turkey sausage, casing removed
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1 medium onion, finely chopped
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1 medium red bell pepper, seeded and finely chopped
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One 1-pound loaf rustic French or Italian bread, cut into 1-inch-thick cubes
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2 cups grated Gruyere cheese (8 ounces)
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6 large eggs
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2 cups whole milk
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1 cup heavy cream
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1 1/2 tablespoons sliced fresh chives, plus more for garnish
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Kosher salt and freshly ground black pepper