how to cook beets in the oven
1 Preheat oven to 375 degrees F. 2  Coat beets lightly with oil. 3  Wrap beets in aluminum foil, place on a baking sheet, and roast in the oven until cooked through, approximately 45 to 60 minutes.4  Remove from the oven, let cool for 10 minutes, and then peel and slice into 1/4-inch thick slices. Preheat oven to 375 degrees F. 2  Coat beets lightly with oil. 3  Wrap beets in aluminum foil, place on a baking sheet, and roast in the oven until cooked through, approximately 45 to 60 minutes.