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.