1. In a 2-litre microwave-proof bowl, melt 3 to 4 cups of semisweet chocolate chips and same amount of peanut butter on high power for 3 minutes. Stir well.
2. Add 2 cups of sweetened condensed milk and stir until well blended.
3. Pour mixture into an 8x8 dish lined with waxed paper. Refrigerate until solid.
4. Cut into 40 candy-size squares and serve