Desserts that travel well depend on how far and by what means you're traveling. Most bars like brownies, well-packed, will travel well. If you're driving for a few hours, any dessert in a baking dish, like a fruit crisp or pie, should travel well. I take a slightly damp kitchen towel and place it under the dish to keep it from sliding around the trunk of the car. Puddings like Rum Raisin Rice Pudding (Family Style) can be packed in quart containers and carried in a cooler bag.