Preheat oven to 350ºF. Spray a round nine-inch baking dish with non-stick cooking spray.
Combine first six ingredients in a large bowl. Spread evenly in baking dish.
Combine flour, butter, and sugar in a medium bowl. Layer mixture evenly over potatoes in the dish. Arrange pecan halves over top to cover completely. Bake for 30 to 35 minutes, or until hot throughout.
