1. To prepare dressing, combine first 5 ingredients, stirring with a whisk.
2. Preheat oven to 375°.
3. To prepare salad, leave root and 1 inch of stem on beets; scrub with a brush. Place beets in an 11 x 7–inch baking dish; add 1/2 cup water. Cover and bake at 375° for 35 minutes or until tender. Drain and cool. Trim off beet roots; rub off skins. Cut each beet into quarters. Place beets in a small bowl; drizzle with 1 tablespoon dressing.
4. Place salad greens on a large platter; sprinkle evenly with 1/4 teaspoon salt. Drizzle remaining dressing over greens. Top with beets, walnuts, cheese, and chives.