Preheat oven to 350. Add 1 tsp salt and sugar to water and simmer squash over low heat, covered, 15 minutes. Drain squash and return to pan. Add 4 tbls butter and blend w/squash. Stir in cheddar cheese, sour cream, green onions, 1 tsp salt and parmesan cheese. Pour squash mixture into greased casserole dish. Top w/bread crumbs and dot w/remaining butter. Bake 30 minutes.
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