1Heat oven to 450°F. In 12-inch ovenproof skillet, heat oil over medium heat. Cook garlic in oil 1 minute. Add potatoes, onion, rosemary, salt and pepper. Stir to blend. Cook over medium heat about 10 minutes or until potatoes are tender, turning potato mixture halfway through cook time. Stir in cooked sausage.
2In large bowl, beat eggs and milk with whisk. Pour over potato mixture in skillet. Cook 2 minutes. Place in oven.
3Bake pan of mixture about 12 minutes or until golden brown. Top with cheese; bake 2 minutes longer or until cheese is melted.