Begin layering: Start with a single layer of potatoes, slightly overlapping, in the buttered baking dish. Lightly drizzle with cream mixture. Follow with a light sprinkling of parmesan cheese (about 1 Tbsp.). Then place parsnips on top in a single layer, lightly drizzling with cream mixture and sprinkling with 1 Tbsp. parmesan. Repeat with potatoes, cream and parmesan. Add the sautéed onions. Layer parsnips, cream and parmesan. Repeat with potatoes, cream and parmesan. The top layer will be the remaining parsnips (see note). Pour the rest of the whipping cream mixture over the parsnips and sprinkle with 2 to 3 Tbsp. parmesan.
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