Heat a medium saucepan over medium-high heat. Coat pan with cooking spray. Add onion to pan; sauté 3 minutes. Stir in pasta, broth, wine, and thyme; bring to a boil. Cover, reduce heat, and simmer 15 minutes or until liquid is absorbed and pasta is al dente. Stir in chopped chives and lemon juice. Keep warm.
Heat oil in a large cast-iron skillet over medium-high heat. Sprinkle scallops evenly with salt and pepper. Add scallops to pan; cook 3 minutes on each side or until desired degree of doneness. Serve with pasta mixture.