- In a large bowl mix butter, brown sugar, vanilla, and egg yolk. Stir in flour and salt.
- Press dough into ungreased 13x9x2-inch temp-tations® Lid-It®.
- Bake bars in a preheated 350°F oven for 25-30 minutes or until light brown.
- Immediately sprinkle chocolate morsels on hot crust. Let stand abut 5 minutes or until chocolate is soft, then spread evenly.
- Sprinkle with nuts and colored sprinkles, if desired.
- Cool bars at least 30 minutes, then cut into small squares.