Sweet Potato Puff
["5 c. mashed sweet potatoes", "1 (7 oz.) can pineapple tidbits", "1/2 c. black walnuts, chopped", "miniature marshmallows"]
["Combine sweet potatoes, pineapple and nuts.", "Spray a 2-quart casserole with Pam or oil with margarine.", "Alternate layers of sweet potato mixture and marshmallows, ending with marshmallows. Bake 30 minutes at 350\u00b0.", "Will serve 10 to 12."]
["mashed sweet potatoes", "pineapple tidbits", "black walnuts", "marshmallows"]