Preheat oven to 350* F. Combine flour and brown sugar in a bowl; cut in butter until crumbly. Press into bottom of an ungreased 13x9x2 inch baking pan. Top with pecans; drizzle warmed caramel topping evenly over pecans.
Bake at 350* F for 15-20 minutes or until caramel is bubbly. Place on wire rack. Sprinkle with chocolate chips; let stand 5 minutes, then spread chocolate chips over caramel-pecan layer.
Cool for at least 6 hours at room temp or until chocolate has set (chilling may cause chocolate to appear dull). Cut into bars.