Instructions

1. Heat the oven to 325F. In a large bowl, beat 1/2 cup butter, 1/2 cup brown sugar, the vanilla and the egg with an electric mixer on medium speed until light and fluffy. On low speed, beat in the flour, baking soda and salt. Reserve 1/3 of the toffee pieces for garnish. Stir remaining chopped candy into the dough. Shape dough into 1-inch balls. On ungreased cookie sheets, place balls 1 inch apart.
2. Bake 11 to 14 minutes or until edges start to brown and tops of cookies feel set when tapped. Place cooling racks on waxed paper. Immediately remove cookies from cookie sheets to cooling racks.
3. Meanwhile, in a 1-quart saucepan, heat 1/4 cup butter, 1/2 cup brown sugar and 2 tablespoons of the milk over medium-low heat , stirring frequently, until mixture just comes to a boil and sugar is dissolved. Stir in powdered sugar; beat with a wire whisk if necessary to remove lumps. Immediately dip tops of cookies into glaze or spread on top of cookies. (Cookies don’t need to be completely cooled, just firm and set.) Place on rack; let stand about 10 minutes until glaze is set. If glaze starts to set in saucepan, reheat over medium-low heat and beat with a wire whisk.
4. Place chocolate chips and vanilla chips in separate small microwaveable bowls. Microwave each on high for 1 1/2 to 2 minutes, stirring every 30 seconds until melted and smooth. Using the tip of a spoon, drizzle each flavor generously over cookies. Alternately, place the chips in a zip top bag, microwave until melted, and then cut off the corner and drizzle over cookies. Sprinkle with remaining candy. Refrigerate 20 minutes to set quickly.