Toffee Bit Triangles

1c. Butter, softened
1c. brown sugar
1 tsp. vanilla
1 egg yolk
2c. flour
1 1/3c (8oz pkg) Heath Bits, divided
2 cups (12 oz) semi-sweet chocolate chips

Beat butter until creamy, beat in brown sugar, vanilla and yolk. Stir in flour and
1 cupHeath bits. Press into ungreased jelly roll pan. Bake 18-20 minutes at 350 till light brown. Immediately sprinkle chocolate chips, let stand until softened, spread evenly, sprinkle remaining toffee bits. Cool cut into 3 inch squares, cut each square into triangles...or just call them toffee bit snacks and cut them however you want ;)