01 - Set the oven temperature to 400°F.
02 - Wrap each beet in aluminum foil individually and place on a baking sheet. Roast for 35 to 40 minutes until tender when pierced.
03 - Let beets cool, then peel and slice into 1-inch wedges.
04 - Whisk together olive oil, balsamic vinegar, honey, Dijon mustard, salt, and black pepper in a small bowl until emulsified.
05 - Spread mixed greens on a serving platter. Top with roasted beet slices, crumbled feta, and toasted walnuts.
06 - Drizzle salad with the dressing and sprinkle chopped parsley on top if desired. Serve immediately.