Step 1

Heat oven to 350°F. Line 15x10x1-inch cookie sheet with sides with foil. In large bowl, stir cookie mix, butter and egg until soft dough forms. Stir in 1/2 cup of the toffee bits. Press dough in bottom of pan. Bake 14 to 16 minutes or until light golden brown. Cool 5 minutes on cooling rack.

Step 2

In 2-quart saucepan, heat caramels and cream over medium-low heat, stirring constantly, until caramels are melted, 5 to 10 minutes. Remove from heat. Spread over warm cookie base. Bake 5 minutes. Return to cooling rack. Sprinkle chocolate chips evenly over top. Let stand 3 minutes; spread melted chips evenly over filling. Sprinkle with sea salt and remaining 1/2 cup toffee bits. Refrigerate bars until chocolate is firm, about 15 minutes. Cut into 8 rows by 4 rows. Store at room temperature in airtight container.