INGREDIENTS
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1 1/2 cups finely chopped onion
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1 cup finely chopped scallion
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3/4 pound mushrooms, sliced thin
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3 tablespoons olive oil
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2 red bell peppers, cut into thin strips (about 2 cups)
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2 green bell peppers, cut into thin strips (about 2 cups)
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enough Italian bread cut into 1-inch cubes to measure 9 cups (about 1 1/2 loaves)
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2 1/2 cups coarsely grated extra-sharp Cheddar (about 10 ounces)
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1 cup freshly grated Parmesan
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12 large eggs
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3 1/2 cups milk
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3 tablespoons Dijon-style mustard
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Tabasco to taste