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