1Heat panini pan over medium heat or heat contact grill 5 minutes. Press sausage patties into thinner patties, about 3 to 4 inches in diameter. Cook sausage in panini pan 2 to 3 minutes on each side, or cook in contact grill 2 to 3 minutes, or until thoroughly cooked. Wipe surface of pan or grill. Spray weighted top of panini pan with cooking spray.
2In small bowl, beat eggs, milk and mustard with wire whisk. Dip muffin halves in egg mixture, soaking well. Place 1 cheese slice and 1 sausage patty on each of 6 muffin halves; top with bacon and second slice of cheese. Cover with remaining muffin halves.
3Place 3 sandwiches on panini pan; place weighted top over muffins. Cook 2 minutes or until browned. Turn; cook 2 minutes longer or until browned and hot in center. Repeat with remaining sandwiches. Or cook sandwiches in contact grill 2 to 3 minutes.