Slice pears lengthwise and remove seeds with a spoon or melon-baller. Place pears, sliced side up, in a large nonstick skillet over medium-high heat with orange juice and light brown sugar. Cover pan with lid or aluminum foil and simmer until pears begin to soften, about 5 min. Remove lid, turn pears over and simmer another 2 min.
Heat broiler with rack 6 inches from heat. Line a baking sheet with foil; transfer pears, sliced side up, to pan and broil 1 to 2 min until caramelized. Continue to simmer juice in skillet, scraping sides with a spatula as needed. Reduce sauce until just thickened and about ⅓ remains. Serve pears with fat free Greek yogurt, cinnamon and sauce.
For a fun, seasonal swap, use mandarin or clementine juice in place of the orange juice.