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âFixer Upperâ Season 4 Behind-The-Scenes Photo Teases Opening Of Joanna And Chip Gainesâ Bakery. By On 04/12/16 AT 11:04 AM. Chip and Joanna Gaines will feature their new bakery Magnolia Flour in Season 4 of HGTV's âFixer Upper.â Photo: HGTV.