4 large Vidalia onions, thickly sliced (about
1/2-inch)
1/2 cup (1 stick) butter or margarine
2/3 cup chicken broth
1/3 cup sherry
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2 tablespoons flour
1 1/2 cups soft bread crumbs
1/2 cup grated sharp cheddar cheese
2 tablespoons grated Parmesan cheese
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