1Heat oven to 400°F. Cut 18x12-inch sheet of heavy-duty foil; spray foil with cooking spray. In large bowl, toss beets, orange slices, oil, salt and pepper. Spoon mixture in center of foil. Bring up 2 sides of foil over mixture so edges meet. Seal edges, making tight 1/2-inch fold; fold again, allowing space for heat circulation and expansion. Place packet on cookie sheet.
2Roast 45 minutes. Carefully unfold foil with tongs; roast 10 minutes longer or until beets are tender and browned.
3In 12-inch skillet, melt butter over medium-high heat. Stir in parsley, rosemary and orange juice with whisk; cook 1 to 2 minutes or until slightly thickened. Remove beets and oranges from foil and add to skillet; cook and stir until coated with butter mixture.