Caramel-Pecan Cookie Butter Bars

Preheat oven to 375°. In a large bowl, cream butter, sugars and cookie butter until light and fluffy, 5-7 minutes. Beat in egg. Gradually beat in flour. Spread onto bottom of greased 13x9-in. baking pan. Sprinkle with pecans; press lightly into dough. Bake until edges are lightly browned, 15-20 minutes., Meanwhile, in a large saucepan, combine caramels and cream. Cook and stir over medium-low heat until caramels are melted. Remove from heat; stir in vanilla. Pour over crust. Cool completely in pan on a wire rack., In a microwave, melt chocolate chips and shortening; stir until smooth. Drizzle over bars; let stand until set. Cut into bars.