In a large skillet, saute onion in oil until tender. Add andouille sausage; cook 1 minute longer. Transfer to a large bowl. Stir in the Creole seasoning, 1/4 teaspoon garlic powder, salt and pepper. Crumble turkey and turkey sausage over mixture and mix well. Shape into two patties.
In a large skillet over medium heat, cook burgers for 5-7 minutes on each side or until a thermometer reads 165° and juices run clear. Top with cheese; cover and cook for 1-2 minutes or until cheese is melted.
For remoulade, in a small bowl, combine the Miracle Whip, lemon juice, pepper sauce, relish and capers. Spread rolls with butter and sprinkle with remaining garlic powder. Broil 4 in. from the heat for 2-3 minutes or until lightly browned. Serve burgers on rolls with remoulade.