Ingredients

2 sweet potatoes, peeled and cut into 1-inch chunks

1 medium red onion, quartered

2 tablespoons olive oil

Coarse salt and ground pepper

1 package (10 ounces) frozen cut green beans, thawed

1/3 cup walnuts

1 cup plain low-fat yogurt

2 tablespoons white-wine vinegar

1 garlic clove, crushed through a garlic press

1 head (10 ounces) red-leaf lettuce, torn into bite-size pieces

Preparation

Preheat oven to 450 degrees. On a large rimmed baking sheet, toss together sweet potatoes, onion, and oil; season with salt and pepper. Roast until sweet potatoes are tender, about 20 minutes.

Add green beans and walnuts to sheet; toss. Roast until green beans are tender, about 5 minutes.

Meanwhile, in a small bowl, whisk together yogurt, vinegar, and garlic; season dressing with salt and pepper. Top lettuce with roasted vegetable mixture; drizzle with dressing.