Whether you serve this hearty salad in individual portions or a serving bowl, be sure to choose glass to show off the colorful layers.
Place 3 cups of the lettuce in the bottom of a 3-quart clear salad bowl (or divide it among eight bowls or jars). Layer ingredients in the following order: black beans, tomatoes, frozen corn, sweet pepper, carrot, remaining lettuce, ham, green onions and cheese.
In a small bowl, stir together mayonnaise, sour cream and chili powder. Spoon dressing over salad, sealing to edge of bowl. Cover tightly with plastic wrap. Chill in the refrigerator for 6 to 24 hours.
To serve, garnish with radish slices and sprinkle with cilantro. Toss lightly to coat evenly to serve.