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Adjust rack to middle position and preheat oven to 300 degrees. Line a baking sheet with foil.
Place ribs* on prepared sheet; spread tops with any remaining sauce from package. Tightly cover with foil. Bake on middle rack until ribs are warmed through, 45-60 minutes.
TIP: If ribs are ready before the rest of the meal, turn off oven and leave ribs inside to keep warm. If you want an extra-sticky and caramelized glaze, remove foil cover and broil ribs for 2-3 minutes before serving.