Preheat oven to 350 degrees. In large, nonstick skillet over medium heat, heat 1 tablespoon oil. Add turkey, thyme, garlic powder, pepper and salt, if desired. Cook 5–7 minutes, until cooked through, stirring occasionally and breaking turkey into large crumbles.
Stir in potato salad and sour cream. Add vegetables; stir. Spray 2-quart dish with nonstick cooking spray. Spoon in casserole mixture.
Toss together bread crumbs and remaining oil. Sprinkle over casserole.
Bake 30 minutes, or until bubbly and heated through.