1. Cover tray with wax paper. Peel bananas; cut diagonally into 1-inch pieces. Place straw piece halfway into each banana piece. Place on prepared tray; cover and freeze until firm.
2. Coarsely chop 1/2 cup butterscotch chips; set aside in small bowl. Coarsely chop 1/2 cup chocolate chips; set aside in separate small bowl.
3. Place remaining 1/2 cup butterscotch chips and 2 teaspoons shortening in small microwave-safe bowl.. Microwave at MEDIUM (50%) 30 seconds; stir. Continue heating 10 seconds at a time or until mixture is melted and smooth when stirred. Dip half of banana pieces into butterscotch mixture, covering each banana piece completely; roll in chopped chocolate chips. Place back on prepared tray. Cover; return to freezer until set.
4. Repeat melting procedure with remaining 1/2 cup chocolate chips and remaining 2 teaspoons shortening. Coat remaining banana pieces; roll in chopped butterscotch chips. Cover; return to freezer. About 1-1/2 dozen snacks.