This side dish is both extremely simple (only two steps!) and deliciously elegant. The prosciutto and Asiago add cheesiness, while thyme and fennel add freshness.
Preheat oven to 400°F. In a shallow baking pan combine fennel wedges and onions. Drizzle with oil and sprinkle with salt and pepper; toss to coat.
Roast 35 to 40 minutes or until tender and light brown, stirring occasionally. Sprinkle with remaining ingredients.