Preheat oven to 200°c.
Prepare MAGGI Creamy Cheese & Garlic Potato Bake Recipe Mix following packet directions and place in oven.
Place crust ingredients in food processor, process into crumbs.
Spread mustard over lamb rack, firmly press crust mixture over top.
Place lamb racks, crust side up, in baking dish and cook 25 minutes or until medium rare. Allow to stand 5 minutes before carving.
Serve with potato bake and oven-roasted vine-ripened tomatoes, if desired.