Although it may seem like a virtuous menu choice, Cobb salad is often loaded with bacon, blue cheese, and other high-calorie fare. This version keeps the calories under control and adds a twist by packing everything in jars, so you can make portable portions ahead of time. A rule of thumb when packing salads in jars is to place the dressing on the bottom, followed by sturdy items such as tomatoes and avocado. To prevent wilting, delicate foods such as greens should stay on top.