In a saucepan, heat the brown sugar, corn syrup, butter and salt over medium heat for 5 minutes or until sugar is dissolved, stirring constantly.
In a large heat-proof bowl, combine the remaining ingredients. Pour hot syrup over cereal mixture; stir until well coated. Spread into greased 15x10x1-in. baking pan. Bake at 300° for 30 minutes or until crisp, stirring every 10 minutes. Cool on a wire rack until slightly firm.