Preheat oven to 350°. Spray with non-stick coating or grease an 8 x 8 x 2-inch baking pan. In a small bowl, stir brown sugar, nuts, 2 tablespoons baking mix, butter, and cinnamon until blended; set aside. In a small bowl, mix 2 cups baking mix, sugar, milk, and egg. Beat 30 seconds. Spread half of the batter in pan, then half of the sugar-nut mixture and remaining batter. Arrange apple slices on top, pushing edges slightly into batter. Sprinkle with sugar-nut mixture. Bake 35 to 40 minutes until a wooden pick inserted in center comes out clean. Serve warm or at room temperature. Cover leftovers with foil and store overnight at room temperature. If desired, reheat before serving. Makes 9 servings. bake 72