Preparation Preheat oven to 400°F. Arrange onions in single layer on rimmed baking sheet; drizzle 1/4 cup olive oil over; turn onions to coat. Sprinkle with salt. Roast until soft and brown on edges, turning every 15 minutes, about 1 hour. Transfer to platter. Sprinkle with salt and pepper. Cool. (Can be made 4 hours ahead. Cover; let stand at room temperature.) Sprinkle cheese over onions. Drizzle 1/4 cup extra-virgin olive oil, then vinegar over cheese and onions. Sprinkle with almonds, then chives and serve.
Preparation Preheat oven to 400°F. Arrange onions in single layer on rimmed baking sheet; drizzle 1/4 cup olive oil over; turn onions to coat. Sprinkle with salt. Roast until soft and brown on edges, turning every 15 minutes, about 1 hour. Transfer to platter. Sprinkle with salt and pepper. Cool. (Can be made 4 hours ahead. Cover; let stand at room temperature.) Sprinkle cheese over onions. Drizzle 1/4 cup extra-virgin olive oil, then vinegar over cheese and onions. Sprinkle with almonds, then chives and serve.