Place eggplant slices on a baking sheet coated with cooking spray. Coat both sides of eggplant with cooking spray, and sprinkle evenly with 1/4 teaspoon salt. Bake at 400° for 20 minutes or until browned, turning once. Place cooked slices on a cutting board, and let stand until cool.
Finely dice eggplant, and place in a medium bowl. Stir in remaining 1/4 teaspoon salt, yogurt, and remaining ingredients. Serve immediately, or cover and chill until ready to serve. Bring to room temperature before serving.