• 1 cup olive oil, divided
• 1 ½ teaspoons salt, divided
• 1 red onion, cut into wedges
• 4 carrots, peeled and chopped
• 2 parsnips, peeled, chopped
• 1 sweet potato, peeled, chopped
• ¾ teaspoon pepper, divided
• 2 tablespoons balsamic vinegar
• 1 tablespoon lemon juice
• 1 tablespoon dijon mustard
• ½ teaspoon garlic powder
• 3 tablespoons fresh parsley, chopped
• ½ cup crumbled feta cheese