To prepare turkey, heat 1 tablespoon of oil in a large nonstick skillet over medium-high heat. Add mushrooms and chopped onion to pan; sauté 5 minutes or until lightly browned. Add turkey and next 5 ingredients (through salt) to pan; cook 5 minutes or until liquid is absorbed.
To prepare dressing, combine 2 tablespoons vinegar and next 6 ingredients (through garlic) in a small bowl, stirring with a whisk.
To prepare salad, cook pasta according to package directions, omitting salt and fat; drain. Combine lettuce and remaining ingredients except mint sprigs. Place about 2 cups lettuce mixture into each of 4 bowls. Top each with 1 cup noodles and 1 1/2 cups turkey mixture; drizzle each with 1 1/2 tablespoons dressing. Garnish with mint sprigs, if desired.