Cook squash in a small amount of boiling salted water until tender; drain well, and mash. Cook bacon until crisp; drain well, reserving drippings. Crumble bacon. Saute onion in drippings.
Combine all ingredients, stirring well. Spoon in a lightly greased 1 1/2- quart casserole. Bake at 350 degrees for 30 minutes.
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