Brown the turkey with chili powder in a large, heavy skillet, stirring to crumble. Drain and place in a bowl; toss with 2 tablespoons lime juice and salt. Set this aside. Heat olive oil in skillet over medium-high heat. Add red onion, and saute 3 to 4 minutes or until just tender and beginning to brown. Stir in corn, beans, and pickled jalapenos; add to turkey mixture. Preheat oven to 400 degrees F. Arrange 3 tortillas on bottom of a 13X9- inch baking dish, tearing to fit. Sprinkle 1/3 of cheese over tortillas. Spon 1/3 of bean mizture on cheese, and arrange 1/3 of tomato slices on bean mixture. Repeat layers twice more. Cover with aluminum foil. Bake 20 minutes. Uncover and bake 10 minutes. Let stand 5 minutes before serving. Serve with sour cream and salsa, if desired.