MICROWAVE morsels in medium, microwave-safe bowl on MEDIUM-HIGH (70 percent) power for 1 minute; stir. Microwave at additional 10- to 20-second intervals, stirring until smooth. Add 1 -2 TBSPs vegetable oil.
PLACE peppermint candies in heavy-duty plastic bag. Crush candies using rolling pin or other heavy object. While holding strainer over melted morsels, pour crushed candy into strainer. Shake to release all small candy pieces; reserve larger candy pieces. Stir morsel-peppermint mixture.
SPREAD mixture to desired thickness on prepared baking sheet. Sprinkle with reserved candy pieces; press in lightly. Let stand for about 1 hour or until firm. Break into pieces. Store in airtight container at room temperature.