INGREDIENTS
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4 T olive oil, plus more for the baking dish
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1 medium onion, chopped
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8- to 10-ounce package button mushrooms, trimmed and quartered
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1/2 C chopped fresh flat-leaf parsley
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6 large eggs
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2 C whole milk
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kosher salt and black pepper
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1/2 lb. country bread, cut into 1-inch pieces (about 6 cups)
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1/2 lb. fontina or Cheddar, grated
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4 C mixed greens (about 3 ounces)
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2 t white wine vinegar