INGREDIENTS
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3 tablespoons butter
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1 cup sweet onion, chopped fine
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2 cups mushrooms, chopped finely
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1 cup mozzarella cheese, grated
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1/4 cup parmesan cheese
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1 teaspoon parsley flakes
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1 large egg, beaten
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1/2 teaspoon oregano
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salt & pepper
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12 slices square bread, crusts removed (white or whole wheat, I prefer the whole wheat)
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1/3 cup butter, softened
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3 slices Kraft processed cheese slices