01 - Set the oven temperature to 400°F.
02 - Wrap each beet individually in aluminum foil, place on a baking sheet, and roast for 40 to 50 minutes until tender when pierced with a knife.
03 - Allow the roasted beets to cool slightly, then peel off the skins and cut into bite-sized wedges or cubes.
04 - Toast walnuts in a dry skillet over medium heat for 3 to 4 minutes, stirring frequently until fragrant; set aside to cool.
05 - Whisk together olive oil, balsamic vinegar, Dijon mustard, honey, salt, and pepper in a small bowl until well combined.
06 - Arrange mixed greens on a large platter or divide among plates; top with roasted beets, toasted walnuts, and crumbled goat cheese.
07 - Drizzle salad with the dressing and sprinkle with fresh chives if desired; serve immediately.