INGREDIENTS
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1/2pound(about 1/2 loaf) white, sourdough, or whole-wheat bread, preferably day-old, sliced 1/2 inch thick
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2tablespoonsolive oil
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2red bell peppers, seeded and thinly sliced
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1medium yellow onion, thinly sliced
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2cloves garlic, finely chopped
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1teaspoonchopped fresh thyme leaves
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1 1/2teaspoonskosher salt
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1/2teaspoonplus 1/8 teaspoon black pepper
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butter for the baking dish
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1cup(4 ounces) grated Gruyere
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4large eggs
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2cupswhole milk