reheat oven to 425°. Toss together green onions, olive oil, and salt in a jelly-roll pan. Bake 10 to 12 minutes or until tender. Cool in pan 5 minutes. Cut onions into 2-inch-long pieces. Spread 2 tsp. mayonnaise onto each of 4 toasted sourdough bread slices. Layer each with one-fourth of green onions; 1 hard-cooked egg, sliced; and, if desired, 1 Tbsp. country ham. Top with desired amount of freshly grated Parmesan cheese.
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