Preheat oven to 375'F. In large bowl, combine flour, brown sugar, baking soda and salt. With pastry blender or 2 knives, cut in butter until mixture resembles fine crumbs. Stir in oats; press half of oat mixture into greased 13x9 inch baking pan. To remaining oat mixture, add Nestle Toll House semi-sweet chocolate mini morsels, apples and pecans; stir to combine. Sprinkle over base. Bake 35-40 minutes until lightly browned. Cool slightly; cut into squares. Makes about 15 servings.