Meanwhile, in 12-inch nonstick skillet, heat oil over medium-high heat. Saute mushrooms and onion 7 minutes or until mushrooms are soft and onion is tender. Stir in pears, cooked potatoes and sage. saute 3 to 4 minutes longer or until potatoes are tender. Stir in broth, vinegar, salt and pepper. Cook and stir 1 to 2 minutes longer or until broth is reduced slightly. Garnish with sage leaves.