1. Line 9-inch square pan with plastic wrap. Place chocolate chips in large microwave-safe bowl. Microwave at MEDIUM (50%) 1 minute; stir. If necessary, microwave at MEDIUM an additional 15 seconds at a time, stirring after each heating, just until chips are melted and mixture is smooth when stirred. Immediately add toffee bits, peanuts, pretzels and coconut, if desired; stir to coat.
2. Spread mixture in prepared pan; cover with plastic wrap or foil. Refrigerate 45 minutes or until firm.
3. Place white chips and shortening in small microwave-safe bowl. Microwave at MEDIUM 30 seconds; stir. If necessary, microwave at MEDIUM an additional 10 seconds at a time, stirring after each heating just until chips are melted and mixture is smooth when stirred. Using fork, drizzle white chips mixture over chocolate mixture in pan. Cover; refrigerate 5 minutes or until firm.
4. Bring to room temperature. Remove chocolate mixture from pan and place on cutting board, top side up; remove plastic wrap. Cut into 1-1/2 inch squares. Place each square in a candy cup, if desired. Store in covered container in a cool place. About 3 dozen squares.
CHOCOLATE TOFFEE HAYSTACKS: Prepare chocolate mixture as above. Instead of spreading into square pan, drop chocolate mixture by slightly heaping tablespoons onto wax paper-lined cookie sheet or tray. Refrigerate until firm. Melt white chips as directed above; drizzle over haystacks.