Preheat oven to 350 degrees F(175 degrees C) and grease a 9x13-inch pan.
Step 2
Cream butter and sugar. Beat in egg, peppermint extract, and food coloring. Add flour and salt till well blended. Stir in 2/3 cup finely crushed candy. Spread evenly into the greased pan.
Step 3
Bake until firm, about 25 minutes.
Step 4
After removing from oven, immediately sprinkle with chocolate chips. Cover with a cookie sheet for 1 minute or until melted. Spread chocolate evenly and sprinkle with 1/3 cup coarsely chopped candy. Cool completely before cutting.