Toffee Shortbread Cookies

1 stick of butter, at room temp
1/4 cup confectioners' sugar
1 tsp. vanilla
1 cup flour
1/4 tsp salt
1/2 cup toffee bits
1/2 cup mini chocolate chips (optional)

1.  Preheat oven to 350*.  Using an electric mixer on medium-high speed, cream together butter, sugar & vanilla.  Stir in flour and salt.  Fold in toffee bits (and chocolate chips, if desired).

2.  Roll into 1-inch balls.  Bake for 12-14 minutes.

3.  Place baking sheet on a wire rack for 5 minutes, then transfer cookies to rack to cool.