Heat oven to 325 degrees. Beat margarine, sugar and cinnamon in large mixer bowl on medium speed, scraping bowl constantly, until mixture is light and fluffy, about 2 minutes. Fold in pineapple, bread cubes and pecans. Pour into buttered 1 1/2 quart casserole. Bake until knife inserted in center comes out clean, 40 to 45 minutes. Serve with Caramel Fluff (recipe below) if desired.
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