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BBQ Baby Back Ribs Adjust racks to middle and top positions and preheat oven to 400 degrees. Line a baking sheet with foil. Place ribs on prepared sheet; spread tops with any remaining sauce from package. Sprinkle with 2 TBSP water to maintain moisture. Tightly cover with foil. Bake on middle rack until ribs are warmed through and sauce is lightly caramelized around the edges, 40-45 minutes. Keep covered until ready to serve.