PREHEAT oven to 375° F. Grease 9-inch deep-dish pie plate.
COMBINE crumbs and sugar in pie plate. Stir in butter. Press crumb mixture onto bottom and up sides of prepared pie plate.
BAKE for 8 minutes. Cool completely on wire rack.
PLACE gelatin in small bowl; stir in water. Let soften for 1 minute.
HEAT evaporated milk and softened gelatin in small saucepan over medium heat, stirring constantly with whisk until mixture is dissolved and hot. Remove from heat; stir in morsels and peppermint extract until completely melted and smooth. Pour into medium bowl. Refrigerate uncovered for 30 minutes, stirring occasionally, until cool to touch. Gently whisk in 2 cups whipped topping. Sprinkle 1/4 cup candies over bottom of crust. Pour filling over pie crust.
REFRIGERATE for 2 hours or until set. Spread remaining whipped topping over center of filling. Sprinkle with remaining 1/4 cup candies. Serve immediately.