01 - Set the oven temperature to 400°F.
02 - Wrap each beet in aluminum foil, arrange on a baking sheet, and roast for 40 to 50 minutes until tender when pierced with a knife.
03 - Allow roasted beets to cool slightly, peel off skins, then cut into bite-sized wedges or cubes.
04 - In a dry skillet over medium heat, toast walnut halves for 3 to 4 minutes, stirring frequently until aromatic. Remove from heat and cool.
05 - Whisk together olive oil, balsamic vinegar, Dijon mustard, honey, sea salt, and black pepper in a small bowl.
06 - Arrange mixed greens on a platter or individual plates, top with roasted beet pieces, toasted walnuts, and crumbled goat cheese.
07 - Drizzle the dressing over the salad and sprinkle with fresh chives if desired. Serve immediately.