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.