For a smoky flavor, grill the eggplant and bell peppers outdoors. If you don't have cream cheese, goat cheese or ricotta cheese make excellent substitutes. Adjust the amount of balsamic vinegar to your preference for tartness. Toasted pine nuts or walnuts add a delightful crunch to this salad. This salad is also delicious served cold, though the eggplant will soften as it sits.