Zippy Turkey Tortilla Bake

In a skillet, saute onion and garlic powder in oil until the onion is tender. Add turkey, vinegar, chili powder, oregano, cumin and cayenne; cook and stir over medium heat until turkey is no longer pink. Stir in beans. Remove from the heat. Combine salsa and broth; spread a thin layer in a 2-1/2-qt. baking dish coated with nonstick cooking spray. Cut tortillas into 1-in. strips and then into thirds; arrange half over salsa mixture. Top with half of the turkey mixture and half of the remaining salsa mixture. Repeat layers. Sprinkle with cheese. Cover and bake at 350 degrees F for 25 minutes or until bubbly. Top servings with sour cream.